| /* sun4c.c: Doing in software what should be done in hardware. |
| * |
| * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
| * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
| * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au) |
| * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org) |
| * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| |
| #define NR_TASK_BUCKETS 512 |
| |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/init.h> |
| #include <linux/bootmem.h> |
| #include <linux/highmem.h> |
| #include <linux/fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/scatterlist.h> |
| #include <linux/bitmap.h> |
| |
| #include <asm/sections.h> |
| #include <asm/page.h> |
| #include <asm/pgalloc.h> |
| #include <asm/pgtable.h> |
| #include <asm/vaddrs.h> |
| #include <asm/idprom.h> |
| #include <asm/machines.h> |
| #include <asm/memreg.h> |
| #include <asm/processor.h> |
| #include <asm/auxio.h> |
| #include <asm/io.h> |
| #include <asm/oplib.h> |
| #include <asm/openprom.h> |
| #include <asm/mmu_context.h> |
| #include <asm/highmem.h> |
| #include <asm/btfixup.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlbflush.h> |
| |
| /* Because of our dynamic kernel TLB miss strategy, and how |
| * our DVMA mapping allocation works, you _MUST_: |
| * |
| * 1) Disable interrupts _and_ not touch any dynamic kernel |
| * memory while messing with kernel MMU state. By |
| * dynamic memory I mean any object which is not in |
| * the kernel image itself or a thread_union (both of |
| * which are locked into the MMU). |
| * 2) Disable interrupts while messing with user MMU state. |
| */ |
| |
| extern int num_segmaps, num_contexts; |
| |
| extern unsigned long page_kernel; |
| |
| /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. |
| * So let's save some cycles and just use that everywhere except for that bootup |
| * sanity check. |
| */ |
| #define SUN4C_VAC_SIZE 65536 |
| |
| #define SUN4C_KERNEL_BUCKETS 32 |
| |
| /* Flushing the cache. */ |
| struct sun4c_vac_props sun4c_vacinfo; |
| unsigned long sun4c_kernel_faults; |
| |
| /* Invalidate every sun4c cache line tag. */ |
| static void __init sun4c_flush_all(void) |
| { |
| unsigned long begin, end; |
| |
| if (sun4c_vacinfo.on) |
| panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); |
| |
| /* Clear 'valid' bit in all cache line tags */ |
| begin = AC_CACHETAGS; |
| end = (AC_CACHETAGS + SUN4C_VAC_SIZE); |
| while (begin < end) { |
| __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : |
| "r" (begin), "i" (ASI_CONTROL)); |
| begin += sun4c_vacinfo.linesize; |
| } |
| } |
| |
| static void sun4c_flush_context_hw(void) |
| { |
| unsigned long end = SUN4C_VAC_SIZE; |
| |
| __asm__ __volatile__( |
| "1: addcc %0, -4096, %0\n\t" |
| " bne 1b\n\t" |
| " sta %%g0, [%0] %2" |
| : "=&r" (end) |
| : "0" (end), "i" (ASI_HWFLUSHCONTEXT) |
| : "cc"); |
| } |
| |
| /* Must be called minimally with IRQs disabled. */ |
| static void sun4c_flush_segment_hw(unsigned long addr) |
| { |
| if (sun4c_get_segmap(addr) != invalid_segment) { |
| unsigned long vac_size = SUN4C_VAC_SIZE; |
| |
| __asm__ __volatile__( |
| "1: addcc %0, -4096, %0\n\t" |
| " bne 1b\n\t" |
| " sta %%g0, [%2 + %0] %3" |
| : "=&r" (vac_size) |
| : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) |
| : "cc"); |
| } |
| } |
| |
| /* File local boot time fixups. */ |
| BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) |
| BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) |
| BTFIXUPDEF_CALL(void, sun4c_flush_context, void) |
| |
| #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) |
| #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) |
| #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() |
| |
| /* Must be called minimally with interrupts disabled. */ |
| static void sun4c_flush_page_hw(unsigned long addr) |
| { |
| addr &= PAGE_MASK; |
| if ((int)sun4c_get_pte(addr) < 0) |
| __asm__ __volatile__("sta %%g0, [%0] %1" |
| : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); |
| } |
| |
| /* Don't inline the software version as it eats too many cache lines if expanded. */ |
| static void sun4c_flush_context_sw(void) |
| { |
| unsigned long nbytes = SUN4C_VAC_SIZE; |
| unsigned long lsize = sun4c_vacinfo.linesize; |
| |
| __asm__ __volatile__( |
| "add %2, %2, %%g1\n\t" |
| "add %2, %%g1, %%g2\n\t" |
| "add %2, %%g2, %%g3\n\t" |
| "add %2, %%g3, %%g4\n\t" |
| "add %2, %%g4, %%g5\n\t" |
| "add %2, %%g5, %%o4\n\t" |
| "add %2, %%o4, %%o5\n" |
| "1:\n\t" |
| "subcc %0, %%o5, %0\n\t" |
| "sta %%g0, [%0] %3\n\t" |
| "sta %%g0, [%0 + %2] %3\n\t" |
| "sta %%g0, [%0 + %%g1] %3\n\t" |
| "sta %%g0, [%0 + %%g2] %3\n\t" |
| "sta %%g0, [%0 + %%g3] %3\n\t" |
| "sta %%g0, [%0 + %%g4] %3\n\t" |
| "sta %%g0, [%0 + %%g5] %3\n\t" |
| "bg 1b\n\t" |
| " sta %%g0, [%1 + %%o4] %3\n" |
| : "=&r" (nbytes) |
| : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) |
| : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); |
| } |
| |
| /* Don't inline the software version as it eats too many cache lines if expanded. */ |
| static void sun4c_flush_segment_sw(unsigned long addr) |
| { |
| if (sun4c_get_segmap(addr) != invalid_segment) { |
| unsigned long nbytes = SUN4C_VAC_SIZE; |
| unsigned long lsize = sun4c_vacinfo.linesize; |
| |
| __asm__ __volatile__( |
| "add %2, %2, %%g1\n\t" |
| "add %2, %%g1, %%g2\n\t" |
| "add %2, %%g2, %%g3\n\t" |
| "add %2, %%g3, %%g4\n\t" |
| "add %2, %%g4, %%g5\n\t" |
| "add %2, %%g5, %%o4\n\t" |
| "add %2, %%o4, %%o5\n" |
| "1:\n\t" |
| "subcc %1, %%o5, %1\n\t" |
| "sta %%g0, [%0] %6\n\t" |
| "sta %%g0, [%0 + %2] %6\n\t" |
| "sta %%g0, [%0 + %%g1] %6\n\t" |
| "sta %%g0, [%0 + %%g2] %6\n\t" |
| "sta %%g0, [%0 + %%g3] %6\n\t" |
| "sta %%g0, [%0 + %%g4] %6\n\t" |
| "sta %%g0, [%0 + %%g5] %6\n\t" |
| "sta %%g0, [%0 + %%o4] %6\n\t" |
| "bg 1b\n\t" |
| " add %0, %%o5, %0\n" |
| : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) |
| : "0" (addr), "1" (nbytes), "2" (lsize), |
| "i" (ASI_FLUSHSEG) |
| : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); |
| } |
| } |
| |
| /* Don't inline the software version as it eats too many cache lines if expanded. */ |
| static void sun4c_flush_page_sw(unsigned long addr) |
| { |
| addr &= PAGE_MASK; |
| if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == |
| _SUN4C_PAGE_VALID) { |
| unsigned long left = PAGE_SIZE; |
| unsigned long lsize = sun4c_vacinfo.linesize; |
| |
| __asm__ __volatile__( |
| "add %2, %2, %%g1\n\t" |
| "add %2, %%g1, %%g2\n\t" |
| "add %2, %%g2, %%g3\n\t" |
| "add %2, %%g3, %%g4\n\t" |
| "add %2, %%g4, %%g5\n\t" |
| "add %2, %%g5, %%o4\n\t" |
| "add %2, %%o4, %%o5\n" |
| "1:\n\t" |
| "subcc %1, %%o5, %1\n\t" |
| "sta %%g0, [%0] %6\n\t" |
| "sta %%g0, [%0 + %2] %6\n\t" |
| "sta %%g0, [%0 + %%g1] %6\n\t" |
| "sta %%g0, [%0 + %%g2] %6\n\t" |
| "sta %%g0, [%0 + %%g3] %6\n\t" |
| "sta %%g0, [%0 + %%g4] %6\n\t" |
| "sta %%g0, [%0 + %%g5] %6\n\t" |
| "sta %%g0, [%0 + %%o4] %6\n\t" |
| "bg 1b\n\t" |
| " add %0, %%o5, %0\n" |
| : "=&r" (addr), "=&r" (left), "=&r" (lsize) |
| : "0" (addr), "1" (left), "2" (lsize), |
| "i" (ASI_FLUSHPG) |
| : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); |
| } |
| } |
| |
| /* The sun4c's do have an on chip store buffer. And the way you |
| * clear them out isn't so obvious. The only way I can think of |
| * to accomplish this is to read the current context register, |
| * store the same value there, then read an external hardware |
| * register. |
| */ |
| void sun4c_complete_all_stores(void) |
| { |
| volatile int _unused; |
| |
| _unused = sun4c_get_context(); |
| sun4c_set_context(_unused); |
| _unused = get_auxio(); |
| } |
| |
| /* Bootup utility functions. */ |
| static inline void sun4c_init_clean_segmap(unsigned char pseg) |
| { |
| unsigned long vaddr; |
| |
| sun4c_put_segmap(0, pseg); |
| for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) |
| sun4c_put_pte(vaddr, 0); |
| sun4c_put_segmap(0, invalid_segment); |
| } |
| |
| static inline void sun4c_init_clean_mmu(unsigned long kernel_end) |
| { |
| unsigned long vaddr; |
| unsigned char savectx, ctx; |
| |
| savectx = sun4c_get_context(); |
| for (ctx = 0; ctx < num_contexts; ctx++) { |
| sun4c_set_context(ctx); |
| for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) |
| sun4c_put_segmap(vaddr, invalid_segment); |
| for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) |
| sun4c_put_segmap(vaddr, invalid_segment); |
| for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) |
| sun4c_put_segmap(vaddr, invalid_segment); |
| for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) |
| sun4c_put_segmap(vaddr, invalid_segment); |
| } |
| sun4c_set_context(savectx); |
| } |
| |
| void __init sun4c_probe_vac(void) |
| { |
| sun4c_disable_vac(); |
| |
| if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
| (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { |
| /* PROM on SS1 lacks this info, to be super safe we |
| * hard code it here since this arch is cast in stone. |
| */ |
| sun4c_vacinfo.num_bytes = 65536; |
| sun4c_vacinfo.linesize = 16; |
| } else { |
| sun4c_vacinfo.num_bytes = |
| prom_getintdefault(prom_root_node, "vac-size", 65536); |
| sun4c_vacinfo.linesize = |
| prom_getintdefault(prom_root_node, "vac-linesize", 16); |
| } |
| sun4c_vacinfo.do_hwflushes = |
| prom_getintdefault(prom_root_node, "vac-hwflush", 0); |
| |
| if (sun4c_vacinfo.do_hwflushes == 0) |
| sun4c_vacinfo.do_hwflushes = |
| prom_getintdefault(prom_root_node, "vac_hwflush", 0); |
| |
| if (sun4c_vacinfo.num_bytes != 65536) { |
| prom_printf("WEIRD Sun4C VAC cache size, " |
| "tell sparclinux@vger.kernel.org"); |
| prom_halt(); |
| } |
| |
| switch (sun4c_vacinfo.linesize) { |
| case 16: |
| sun4c_vacinfo.log2lsize = 4; |
| break; |
| case 32: |
| sun4c_vacinfo.log2lsize = 5; |
| break; |
| default: |
| prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", |
| sun4c_vacinfo.linesize); |
| prom_halt(); |
| }; |
| |
| sun4c_flush_all(); |
| sun4c_enable_vac(); |
| } |
| |
| /* Patch instructions for the low level kernel fault handler. */ |
| extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; |
| extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; |
| extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; |
| extern unsigned long num_context_patch1, num_context_patch1_16; |
| extern unsigned long num_context_patch2_16; |
| extern unsigned long vac_linesize_patch, vac_linesize_patch_32; |
| extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; |
| extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; |
| |
| #define PATCH_INSN(src, dst) do { \ |
| daddr = &(dst); \ |
| iaddr = &(src); \ |
| *daddr = *iaddr; \ |
| } while (0) |
| |
| static void __init patch_kernel_fault_handler(void) |
| { |
| unsigned long *iaddr, *daddr; |
| |
| switch (num_segmaps) { |
| case 128: |
| /* Default, nothing to do. */ |
| break; |
| case 256: |
| PATCH_INSN(invalid_segment_patch1_ff, |
| invalid_segment_patch1); |
| PATCH_INSN(invalid_segment_patch2_ff, |
| invalid_segment_patch2); |
| break; |
| case 512: |
| PATCH_INSN(invalid_segment_patch1_1ff, |
| invalid_segment_patch1); |
| PATCH_INSN(invalid_segment_patch2_1ff, |
| invalid_segment_patch2); |
| break; |
| default: |
| prom_printf("Unhandled number of segmaps: %d\n", |
| num_segmaps); |
| prom_halt(); |
| }; |
| switch (num_contexts) { |
| case 8: |
| /* Default, nothing to do. */ |
| break; |
| case 16: |
| PATCH_INSN(num_context_patch1_16, |
| num_context_patch1); |
| break; |
| default: |
| prom_printf("Unhandled number of contexts: %d\n", |
| num_contexts); |
| prom_halt(); |
| }; |
| |
| if (sun4c_vacinfo.do_hwflushes != 0) { |
| PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); |
| PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); |
| } else { |
| switch (sun4c_vacinfo.linesize) { |
| case 16: |
| /* Default, nothing to do. */ |
| break; |
| case 32: |
| PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); |
| break; |
| default: |
| prom_printf("Impossible VAC linesize %d, halting...\n", |
| sun4c_vacinfo.linesize); |
| prom_halt(); |
| }; |
| } |
| } |
| |
| static void __init sun4c_probe_mmu(void) |
| { |
| if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
| (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { |
| /* Hardcode these just to be safe, PROM on SS1 does |
| * not have this info available in the root node. |
| */ |
| num_segmaps = 128; |
| num_contexts = 8; |
| } else { |
| num_segmaps = |
| prom_getintdefault(prom_root_node, "mmu-npmg", 128); |
| num_contexts = |
| prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); |
| } |
| patch_kernel_fault_handler(); |
| } |
| |
| volatile unsigned long __iomem *sun4c_memerr_reg = NULL; |
| |
| void __init sun4c_probe_memerr_reg(void) |
| { |
| int node; |
| struct linux_prom_registers regs[1]; |
| |
| node = prom_getchild(prom_root_node); |
| node = prom_searchsiblings(prom_root_node, "memory-error"); |
| if (!node) |
| return; |
| if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) |
| return; |
| /* hmm I think regs[0].which_io is zero here anyways */ |
| sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); |
| } |
| |
| static inline void sun4c_init_ss2_cache_bug(void) |
| { |
| extern unsigned long start; |
| |
| if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || |
| (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || |
| (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { |
| /* Whee.. */ |
| printk("SS2 cache bug detected, uncaching trap table page\n"); |
| sun4c_flush_page((unsigned int) &start); |
| sun4c_put_pte(((unsigned long) &start), |
| (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE)); |
| } |
| } |
| |
| /* Addr is always aligned on a page boundary for us already. */ |
| static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, |
| unsigned long addr, int len) |
| { |
| unsigned long page, end; |
| |
| *pba = addr; |
| |
| end = PAGE_ALIGN((addr + len)); |
| while (addr < end) { |
| page = va; |
| sun4c_flush_page(page); |
| page -= PAGE_OFFSET; |
| page >>= PAGE_SHIFT; |
| page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | |
| _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); |
| sun4c_put_pte(addr, page); |
| addr += PAGE_SIZE; |
| va += PAGE_SIZE; |
| } |
| |
| return 0; |
| } |
| |
| static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len) |
| { |
| /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ |
| /* XXX Implement this */ |
| } |
| |
| /* TLB management. */ |
| |
| /* Don't change this struct without changing entry.S. This is used |
| * in the in-window kernel fault handler, and you don't want to mess |
| * with that. (See sun4c_fault in entry.S). |
| */ |
| struct sun4c_mmu_entry { |
| struct sun4c_mmu_entry *next; |
| struct sun4c_mmu_entry *prev; |
| unsigned long vaddr; |
| unsigned char pseg; |
| unsigned char locked; |
| |
| /* For user mappings only, and completely hidden from kernel |
| * TLB miss code. |
| */ |
| unsigned char ctx; |
| struct sun4c_mmu_entry *lru_next; |
| struct sun4c_mmu_entry *lru_prev; |
| }; |
| |
| static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; |
| |
| static void __init sun4c_init_mmu_entry_pool(void) |
| { |
| int i; |
| |
| for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { |
| mmu_entry_pool[i].pseg = i; |
| mmu_entry_pool[i].next = NULL; |
| mmu_entry_pool[i].prev = NULL; |
| mmu_entry_pool[i].vaddr = 0; |
| mmu_entry_pool[i].locked = 0; |
| mmu_entry_pool[i].ctx = 0; |
| mmu_entry_pool[i].lru_next = NULL; |
| mmu_entry_pool[i].lru_prev = NULL; |
| } |
| mmu_entry_pool[invalid_segment].locked = 1; |
| } |
| |
| static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, |
| unsigned long bits_off) |
| { |
| unsigned long start, end; |
| |
| end = vaddr + SUN4C_REAL_PGDIR_SIZE; |
| for (start = vaddr; start < end; start += PAGE_SIZE) |
| if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) |
| sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & |
| ~bits_off); |
| } |
| |
| static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) |
| { |
| unsigned long vaddr; |
| unsigned char pseg, ctx; |
| |
| for (vaddr = KADB_DEBUGGER_BEGVM; |
| vaddr < LINUX_OPPROM_ENDVM; |
| vaddr += SUN4C_REAL_PGDIR_SIZE) { |
| pseg = sun4c_get_segmap(vaddr); |
| if (pseg != invalid_segment) { |
| mmu_entry_pool[pseg].locked = 1; |
| for (ctx = 0; ctx < num_contexts; ctx++) |
| prom_putsegment(ctx, vaddr, pseg); |
| fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); |
| } |
| } |
| |
| for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { |
| pseg = sun4c_get_segmap(vaddr); |
| mmu_entry_pool[pseg].locked = 1; |
| for (ctx = 0; ctx < num_contexts; ctx++) |
| prom_putsegment(ctx, vaddr, pseg); |
| fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); |
| } |
| } |
| |
| static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) |
| { |
| int i, ctx; |
| |
| while (start < end) { |
| for (i = 0; i < invalid_segment; i++) |
| if (!mmu_entry_pool[i].locked) |
| break; |
| mmu_entry_pool[i].locked = 1; |
| sun4c_init_clean_segmap(i); |
| for (ctx = 0; ctx < num_contexts; ctx++) |
| prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); |
| start += SUN4C_REAL_PGDIR_SIZE; |
| } |
| } |
| |
| /* Don't change this struct without changing entry.S. This is used |
| * in the in-window kernel fault handler, and you don't want to mess |
| * with that. (See sun4c_fault in entry.S). |
| */ |
| struct sun4c_mmu_ring { |
| struct sun4c_mmu_entry ringhd; |
| int num_entries; |
| }; |
| |
| static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ |
| static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ |
| static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ |
| struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ |
| struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ |
| |
| static inline void sun4c_init_rings(void) |
| { |
| int i; |
| |
| for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { |
| sun4c_context_ring[i].ringhd.next = |
| sun4c_context_ring[i].ringhd.prev = |
| &sun4c_context_ring[i].ringhd; |
| sun4c_context_ring[i].num_entries = 0; |
| } |
| sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = |
| &sun4c_ufree_ring.ringhd; |
| sun4c_ufree_ring.num_entries = 0; |
| sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = |
| &sun4c_ulru_ring.ringhd; |
| sun4c_ulru_ring.num_entries = 0; |
| sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = |
| &sun4c_kernel_ring.ringhd; |
| sun4c_kernel_ring.num_entries = 0; |
| sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = |
| &sun4c_kfree_ring.ringhd; |
| sun4c_kfree_ring.num_entries = 0; |
| } |
| |
| static void add_ring(struct sun4c_mmu_ring *ring, |
| struct sun4c_mmu_entry *entry) |
| { |
| struct sun4c_mmu_entry *head = &ring->ringhd; |
| |
| entry->prev = head; |
| (entry->next = head->next)->prev = entry; |
| head->next = entry; |
| ring->num_entries++; |
| } |
| |
| static inline void add_lru(struct sun4c_mmu_entry *entry) |
| { |
| struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; |
| struct sun4c_mmu_entry *head = &ring->ringhd; |
| |
| entry->lru_next = head; |
| (entry->lru_prev = head->lru_prev)->lru_next = entry; |
| head->lru_prev = entry; |
| } |
| |
| static void add_ring_ordered(struct sun4c_mmu_ring *ring, |
| struct sun4c_mmu_entry *entry) |
| { |
| struct sun4c_mmu_entry *head = &ring->ringhd; |
| unsigned long addr = entry->vaddr; |
| |
| while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) |
| head = head->next; |
| |
| entry->prev = head; |
| (entry->next = head->next)->prev = entry; |
| head->next = entry; |
| ring->num_entries++; |
| |
| add_lru(entry); |
| } |
| |
| static inline void remove_ring(struct sun4c_mmu_ring *ring, |
| struct sun4c_mmu_entry *entry) |
| { |
| struct sun4c_mmu_entry *next = entry->next; |
| |
| (next->prev = entry->prev)->next = next; |
| ring->num_entries--; |
| } |
| |
| static void remove_lru(struct sun4c_mmu_entry *entry) |
| { |
| struct sun4c_mmu_entry *next = entry->lru_next; |
| |
| (next->lru_prev = entry->lru_prev)->lru_next = next; |
| } |
| |
| static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) |
| { |
| remove_ring(sun4c_context_ring+ctx, entry); |
| remove_lru(entry); |
| add_ring(&sun4c_ufree_ring, entry); |
| } |
| |
| static void free_kernel_entry(struct sun4c_mmu_entry *entry, |
| struct sun4c_mmu_ring *ring) |
| { |
| remove_ring(ring, entry); |
| add_ring(&sun4c_kfree_ring, entry); |
| } |
| |
| static void __init sun4c_init_fill_kernel_ring(int howmany) |
| { |
| int i; |
| |
| while (howmany) { |
| for (i = 0; i < invalid_segment; i++) |
| if (!mmu_entry_pool[i].locked) |
| break; |
| mmu_entry_pool[i].locked = 1; |
| sun4c_init_clean_segmap(i); |
| add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); |
| howmany--; |
| } |
| } |
| |
| static void __init sun4c_init_fill_user_ring(void) |
| { |
| int i; |
| |
| for (i = 0; i < invalid_segment; i++) { |
| if (mmu_entry_pool[i].locked) |
| continue; |
| sun4c_init_clean_segmap(i); |
| add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); |
| } |
| } |
| |
| static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) |
| { |
| int savectx, ctx; |
| |
| savectx = sun4c_get_context(); |
| for (ctx = 0; ctx < num_contexts; ctx++) { |
| sun4c_set_context(ctx); |
| sun4c_put_segmap(kentry->vaddr, invalid_segment); |
| } |
| sun4c_set_context(savectx); |
| } |
| |
| static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) |
| { |
| int savectx, ctx; |
| |
| savectx = sun4c_get_context(); |
| for (ctx = 0; ctx < num_contexts; ctx++) { |
| sun4c_set_context(ctx); |
| sun4c_put_segmap(kentry->vaddr, kentry->pseg); |
| } |
| sun4c_set_context(savectx); |
| } |
| |
| #define sun4c_user_unmap(__entry) \ |
| sun4c_put_segmap((__entry)->vaddr, invalid_segment) |
| |
| static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) |
| { |
| struct sun4c_mmu_entry *head = &crp->ringhd; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| if (head->next != head) { |
| struct sun4c_mmu_entry *entry = head->next; |
| int savectx = sun4c_get_context(); |
| |
| flush_user_windows(); |
| sun4c_set_context(ctx); |
| sun4c_flush_context(); |
| do { |
| struct sun4c_mmu_entry *next = entry->next; |
| |
| sun4c_user_unmap(entry); |
| free_user_entry(ctx, entry); |
| |
| entry = next; |
| } while (entry != head); |
| sun4c_set_context(savectx); |
| } |
| local_irq_restore(flags); |
| } |
| |
| static int sun4c_user_taken_entries; /* This is how much we have. */ |
| static int max_user_taken_entries; /* This limits us and prevents deadlock. */ |
| |
| static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) |
| { |
| struct sun4c_mmu_entry *this_entry; |
| |
| /* If some are free, return first one. */ |
| if (sun4c_kfree_ring.num_entries) { |
| this_entry = sun4c_kfree_ring.ringhd.next; |
| return this_entry; |
| } |
| |
| /* Else free one up. */ |
| this_entry = sun4c_kernel_ring.ringhd.prev; |
| sun4c_flush_segment(this_entry->vaddr); |
| sun4c_kernel_unmap(this_entry); |
| free_kernel_entry(this_entry, &sun4c_kernel_ring); |
| this_entry = sun4c_kfree_ring.ringhd.next; |
| |
| return this_entry; |
| } |
| |
| /* Using this method to free up mmu entries eliminates a lot of |
| * potential races since we have a kernel that incurs tlb |
| * replacement faults. There may be performance penalties. |
| * |
| * NOTE: Must be called with interrupts disabled. |
| */ |
| static struct sun4c_mmu_entry *sun4c_user_strategy(void) |
| { |
| struct sun4c_mmu_entry *entry; |
| unsigned char ctx; |
| int savectx; |
| |
| /* If some are free, return first one. */ |
| if (sun4c_ufree_ring.num_entries) { |
| entry = sun4c_ufree_ring.ringhd.next; |
| goto unlink_out; |
| } |
| |
| if (sun4c_user_taken_entries) { |
| entry = sun4c_kernel_strategy(); |
| sun4c_user_taken_entries--; |
| goto kunlink_out; |
| } |
| |
| /* Grab from the beginning of the LRU list. */ |
| entry = sun4c_ulru_ring.ringhd.lru_next; |
| ctx = entry->ctx; |
| |
| savectx = sun4c_get_context(); |
| flush_user_windows(); |
| sun4c_set_context(ctx); |
| sun4c_flush_segment(entry->vaddr); |
| sun4c_user_unmap(entry); |
| remove_ring(sun4c_context_ring + ctx, entry); |
| remove_lru(entry); |
| sun4c_set_context(savectx); |
| |
| return entry; |
| |
| unlink_out: |
| remove_ring(&sun4c_ufree_ring, entry); |
| return entry; |
| kunlink_out: |
| remove_ring(&sun4c_kfree_ring, entry); |
| return entry; |
| } |
| |
| /* NOTE: Must be called with interrupts disabled. */ |
| void sun4c_grow_kernel_ring(void) |
| { |
| struct sun4c_mmu_entry *entry; |
| |
| /* Prevent deadlock condition. */ |
| if (sun4c_user_taken_entries >= max_user_taken_entries) |
| return; |
| |
| if (sun4c_ufree_ring.num_entries) { |
| entry = sun4c_ufree_ring.ringhd.next; |
| remove_ring(&sun4c_ufree_ring, entry); |
| add_ring(&sun4c_kfree_ring, entry); |
| sun4c_user_taken_entries++; |
| } |
| } |
| |
| /* 2 page buckets for task struct and kernel stack allocation. |
| * |
| * TASK_STACK_BEGIN |
| * bucket[0] |
| * bucket[1] |
| * [ ... ] |
| * bucket[NR_TASK_BUCKETS-1] |
| * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) |
| * |
| * Each slot looks like: |
| * |
| * page 1 -- task struct + beginning of kernel stack |
| * page 2 -- rest of kernel stack |
| */ |
| |
| union task_union *sun4c_bucket[NR_TASK_BUCKETS]; |
| |
| static int sun4c_lowbucket_avail; |
| |
| #define BUCKET_EMPTY ((union task_union *) 0) |
| #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ |
| #define BUCKET_SIZE (1 << BUCKET_SHIFT) |
| #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) |
| #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) |
| #define BUCKET_PTE(page) \ |
| ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) |
| #define BUCKET_PTE_PAGE(pte) \ |
| (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) |
| |
| static void get_locked_segment(unsigned long addr) |
| { |
| struct sun4c_mmu_entry *stolen; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| addr &= SUN4C_REAL_PGDIR_MASK; |
| stolen = sun4c_user_strategy(); |
| max_user_taken_entries--; |
| stolen->vaddr = addr; |
| flush_user_windows(); |
| sun4c_kernel_map(stolen); |
| local_irq_restore(flags); |
| } |
| |
| static void free_locked_segment(unsigned long addr) |
| { |
| struct sun4c_mmu_entry *entry; |
| unsigned long flags; |
| unsigned char pseg; |
| |
| local_irq_save(flags); |
| addr &= SUN4C_REAL_PGDIR_MASK; |
| pseg = sun4c_get_segmap(addr); |
| entry = &mmu_entry_pool[pseg]; |
| |
| flush_user_windows(); |
| sun4c_flush_segment(addr); |
| sun4c_kernel_unmap(entry); |
| add_ring(&sun4c_ufree_ring, entry); |
| max_user_taken_entries++; |
| local_irq_restore(flags); |
| } |
| |
| static inline void garbage_collect(int entry) |
| { |
| int start, end; |
| |
| /* 32 buckets per segment... */ |
| entry &= ~31; |
| start = entry; |
| for (end = (start + 32); start < end; start++) |
| if (sun4c_bucket[start] != BUCKET_EMPTY) |
| return; |
| |
| /* Entire segment empty, release it. */ |
| free_locked_segment(BUCKET_ADDR(entry)); |
| } |
| |
| static struct thread_info *sun4c_alloc_thread_info(void) |
| { |
| unsigned long addr, pages; |
| int entry; |
| |
| pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); |
| if (!pages) |
| return NULL; |
| |
| for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) |
| if (sun4c_bucket[entry] == BUCKET_EMPTY) |
| break; |
| if (entry == NR_TASK_BUCKETS) { |
| free_pages(pages, THREAD_INFO_ORDER); |
| return NULL; |
| } |
| if (entry >= sun4c_lowbucket_avail) |
| sun4c_lowbucket_avail = entry + 1; |
| |
| addr = BUCKET_ADDR(entry); |
| sun4c_bucket[entry] = (union task_union *) addr; |
| if(sun4c_get_segmap(addr) == invalid_segment) |
| get_locked_segment(addr); |
| |
| /* We are changing the virtual color of the page(s) |
| * so we must flush the cache to guarantee consistency. |
| */ |
| sun4c_flush_page(pages); |
| sun4c_flush_page(pages + PAGE_SIZE); |
| |
| sun4c_put_pte(addr, BUCKET_PTE(pages)); |
| sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); |
| |
| #ifdef CONFIG_DEBUG_STACK_USAGE |
| memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); |
| #endif /* DEBUG_STACK_USAGE */ |
| |
| return (struct thread_info *) addr; |
| } |
| |
| static void sun4c_free_thread_info(struct thread_info *ti) |
| { |
| unsigned long tiaddr = (unsigned long) ti; |
| unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); |
| int entry = BUCKET_NUM(tiaddr); |
| |
| /* We are deleting a mapping, so the flush here is mandatory. */ |
| sun4c_flush_page(tiaddr); |
| sun4c_flush_page(tiaddr + PAGE_SIZE); |
| |
| sun4c_put_pte(tiaddr, 0); |
| sun4c_put_pte(tiaddr + PAGE_SIZE, 0); |
| |
| sun4c_bucket[entry] = BUCKET_EMPTY; |
| if (entry < sun4c_lowbucket_avail) |
| sun4c_lowbucket_avail = entry; |
| |
| free_pages(pages, THREAD_INFO_ORDER); |
| garbage_collect(entry); |
| } |
| |
| static void __init sun4c_init_buckets(void) |
| { |
| int entry; |
| |
| if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { |
| extern void thread_info_size_is_bolixed_pete(void); |
| thread_info_size_is_bolixed_pete(); |
| } |
| |
| for (entry = 0; entry < NR_TASK_BUCKETS; entry++) |
| sun4c_bucket[entry] = BUCKET_EMPTY; |
| sun4c_lowbucket_avail = 0; |
| } |
| |
| static unsigned long sun4c_iobuffer_start; |
| static unsigned long sun4c_iobuffer_end; |
| static unsigned long sun4c_iobuffer_high; |
| static unsigned long *sun4c_iobuffer_map; |
| static int iobuffer_map_size; |
| |
| /* |
| * Alias our pages so they do not cause a trap. |
| * Also one page may be aliased into several I/O areas and we may |
| * finish these I/O separately. |
| */ |
| static char *sun4c_lockarea(char *vaddr, unsigned long size) |
| { |
| unsigned long base, scan; |
| unsigned long npages; |
| unsigned long vpage; |
| unsigned long pte; |
| unsigned long apage; |
| unsigned long high; |
| unsigned long flags; |
| |
| npages = (((unsigned long)vaddr & ~PAGE_MASK) + |
| size + (PAGE_SIZE-1)) >> PAGE_SHIFT; |
| |
| local_irq_save(flags); |
| base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size, |
| 0, npages, 0); |
| if (base >= iobuffer_map_size) |
| goto abend; |
| |
| high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; |
| high = SUN4C_REAL_PGDIR_ALIGN(high); |
| while (high > sun4c_iobuffer_high) { |
| get_locked_segment(sun4c_iobuffer_high); |
| sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; |
| } |
| |
| vpage = ((unsigned long) vaddr) & PAGE_MASK; |
| for (scan = base; scan < base+npages; scan++) { |
| pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); |
| pte |= pgprot_val(SUN4C_PAGE_KERNEL); |
| pte |= _SUN4C_PAGE_NOCACHE; |
| set_bit(scan, sun4c_iobuffer_map); |
| apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; |
| |
| /* Flush original mapping so we see the right things later. */ |
| sun4c_flush_page(vpage); |
| |
| sun4c_put_pte(apage, pte); |
| vpage += PAGE_SIZE; |
| } |
| local_irq_restore(flags); |
| return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + |
| (((unsigned long) vaddr) & ~PAGE_MASK)); |
| |
| abend: |
| local_irq_restore(flags); |
| printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); |
| panic("Out of iobuffer table"); |
| return NULL; |
| } |
| |
| static void sun4c_unlockarea(char *vaddr, unsigned long size) |
| { |
| unsigned long vpage, npages; |
| unsigned long flags; |
| int scan, high; |
| |
| vpage = (unsigned long)vaddr & PAGE_MASK; |
| npages = (((unsigned long)vaddr & ~PAGE_MASK) + |
| size + (PAGE_SIZE-1)) >> PAGE_SHIFT; |
| |
| local_irq_save(flags); |
| while (npages != 0) { |
| --npages; |
| |
| /* This mapping is marked non-cachable, no flush necessary. */ |
| sun4c_put_pte(vpage, 0); |
| clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, |
| sun4c_iobuffer_map); |
| vpage += PAGE_SIZE; |
| } |
| |
| /* garbage collect */ |
| scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; |
| while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) |
| scan -= 32; |
| scan += 32; |
| high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); |
| high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; |
| while (high < sun4c_iobuffer_high) { |
| sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; |
| free_locked_segment(sun4c_iobuffer_high); |
| } |
| local_irq_restore(flags); |
| } |
| |
| /* Note the scsi code at init time passes to here buffers |
| * which sit on the kernel stack, those are already locked |
| * by implication and fool the page locking code above |
| * if passed to by mistake. |
| */ |
| static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len) |
| { |
| unsigned long page; |
| |
| page = ((unsigned long)bufptr) & PAGE_MASK; |
| if (!virt_addr_valid(page)) { |
| sun4c_flush_page(page); |
| return (__u32)bufptr; /* already locked */ |
| } |
| return (__u32)sun4c_lockarea(bufptr, len); |
| } |
| |
| static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
| { |
| while (sz != 0) { |
| --sz; |
| sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length); |
| sg->dma_length = sg->length; |
| sg = sg_next(sg); |
| } |
| } |
| |
| static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len) |
| { |
| if (bufptr < sun4c_iobuffer_start) |
| return; /* On kernel stack or similar, see above */ |
| sun4c_unlockarea((char *)bufptr, len); |
| } |
| |
| static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
| { |
| while (sz != 0) { |
| --sz; |
| sun4c_unlockarea((char *)sg->dma_address, sg->length); |
| sg = sg_next(sg); |
| } |
| } |
| |
| #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ |
| #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) |
| |
| struct vm_area_struct sun4c_kstack_vma; |
| |
| static void __init sun4c_init_lock_areas(void) |
| { |
| unsigned long sun4c_taskstack_start; |
| unsigned long sun4c_taskstack_end; |
| int bitmap_size; |
| |
| sun4c_init_buckets(); |
| sun4c_taskstack_start = SUN4C_LOCK_VADDR; |
| sun4c_taskstack_end = (sun4c_taskstack_start + |
| (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); |
| if (sun4c_taskstack_end >= SUN4C_LOCK_END) { |
| prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); |
| prom_halt(); |
| } |
| |
| sun4c_iobuffer_start = sun4c_iobuffer_high = |
| SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); |
| sun4c_iobuffer_end = SUN4C_LOCK_END; |
| bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; |
| bitmap_size = (bitmap_size + 7) >> 3; |
| bitmap_size = LONG_ALIGN(bitmap_size); |
| iobuffer_map_size = bitmap_size << 3; |
| sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); |
| memset((void *) sun4c_iobuffer_map, 0, bitmap_size); |
| |
| sun4c_kstack_vma.vm_mm = &init_mm; |
| sun4c_kstack_vma.vm_start = sun4c_taskstack_start; |
| sun4c_kstack_vma.vm_end = sun4c_taskstack_end; |
| sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; |
| sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; |
| insert_vm_struct(&init_mm, &sun4c_kstack_vma); |
| } |
| |
| /* Cache flushing on the sun4c. */ |
| static void sun4c_flush_cache_all(void) |
| { |
| unsigned long begin, end; |
| |
| flush_user_windows(); |
| begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); |
| end = (begin + SUN4C_VAC_SIZE); |
| |
| if (sun4c_vacinfo.linesize == 32) { |
| while (begin < end) { |
| __asm__ __volatile__( |
| "ld [%0 + 0x00], %%g0\n\t" |
| "ld [%0 + 0x20], %%g0\n\t" |
| "ld [%0 + 0x40], %%g0\n\t" |
| "ld [%0 + 0x60], %%g0\n\t" |
| "ld [%0 + 0x80], %%g0\n\t" |
| "ld [%0 + 0xa0], %%g0\n\t" |
| "ld [%0 + 0xc0], %%g0\n\t" |
| "ld [%0 + 0xe0], %%g0\n\t" |
| "ld [%0 + 0x100], %%g0\n\t" |
| "ld [%0 + 0x120], %%g0\n\t" |
| "ld [%0 + 0x140], %%g0\n\t" |
| "ld [%0 + 0x160], %%g0\n\t" |
| "ld [%0 + 0x180], %%g0\n\t" |
| "ld [%0 + 0x1a0], %%g0\n\t" |
| "ld [%0 + 0x1c0], %%g0\n\t" |
| "ld [%0 + 0x1e0], %%g0\n" |
| : : "r" (begin)); |
| begin += 512; |
| } |
| } else { |
| while (begin < end) { |
| __asm__ __volatile__( |
| "ld [%0 + 0x00], %%g0\n\t" |
| "ld [%0 + 0x10], %%g0\n\t" |
| "ld [%0 + 0x20], %%g0\n\t" |
| "ld [%0 + 0x30], %%g0\n\t" |
| "ld [%0 + 0x40], %%g0\n\t" |
| "ld [%0 + 0x50], %%g0\n\t" |
| "ld [%0 + 0x60], %%g0\n\t" |
| "ld [%0 + 0x70], %%g0\n\t" |
| "ld [%0 + 0x80], %%g0\n\t" |
| "ld [%0 + 0x90], %%g0\n\t" |
| "ld [%0 + 0xa0], %%g0\n\t" |
| "ld [%0 + 0xb0], %%g0\n\t" |
| "ld [%0 + 0xc0], %%g0\n\t" |
| "ld [%0 + 0xd0], %%g0\n\t" |
| "ld [%0 + 0xe0], %%g0\n\t" |
| "ld [%0 + 0xf0], %%g0\n" |
| : : "r" (begin)); |
| begin += 256; |
| } |
| } |
| } |
| |
| static void sun4c_flush_cache_mm(struct mm_struct *mm) |
| { |
| int new_ctx = mm->context; |
| |
| if (new_ctx != NO_CONTEXT) { |
| flush_user_windows(); |
| |
| if (sun4c_context_ring[new_ctx].num_entries) { |
| struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| if (head->next != head) { |
| struct sun4c_mmu_entry *entry = head->next; |
| int savectx = sun4c_get_context(); |
| |
| sun4c_set_context(new_ctx); |
| sun4c_flush_context(); |
| do { |
| struct sun4c_mmu_entry *next = entry->next; |
| |
| sun4c_user_unmap(entry); |
| free_user_entry(new_ctx, entry); |
| |
| entry = next; |
| } while (entry != head); |
| sun4c_set_context(savectx); |
| } |
| local_irq_restore(flags); |
| } |
| } |
| } |
| |
| static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) |
| { |
| struct mm_struct *mm = vma->vm_mm; |
| int new_ctx = mm->context; |
| |
| if (new_ctx != NO_CONTEXT) { |
| struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; |
| struct sun4c_mmu_entry *entry; |
| unsigned long flags; |
| |
| flush_user_windows(); |
| |
| local_irq_save(flags); |
| /* All user segmap chains are ordered on entry->vaddr. */ |
| for (entry = head->next; |
| (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); |
| entry = entry->next) |
| ; |
| |
| /* Tracing various job mixtures showed that this conditional |
| * only passes ~35% of the time for most worse case situations, |
| * therefore we avoid all of this gross overhead ~65% of the time. |
| */ |
| if ((entry != head) && (entry->vaddr < end)) { |
| int octx = sun4c_get_context(); |
| sun4c_set_context(new_ctx); |
| |
| /* At this point, always, (start >= entry->vaddr) and |
| * (entry->vaddr < end), once the latter condition |
| * ceases to hold, or we hit the end of the list, we |
| * exit the loop. The ordering of all user allocated |
| * segmaps makes this all work out so beautifully. |
| */ |
| do { |
| struct sun4c_mmu_entry *next = entry->next; |
| unsigned long realend; |
| |
| /* "realstart" is always >= entry->vaddr */ |
| realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; |
| if (end < realend) |
| realend = end; |
| if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { |
| unsigned long page = entry->vaddr; |
| while (page < realend) { |
| sun4c_flush_page(page); |
| page += PAGE_SIZE; |
| } |
| } else { |
| sun4c_flush_segment(entry->vaddr); |
| sun4c_user_unmap(entry); |
| free_user_entry(new_ctx, entry); |
| } |
| entry = next; |
| } while ((entry != head) && (entry->vaddr < end)); |
| sun4c_set_context(octx); |
| } |
| local_irq_restore(flags); |
| } |
| } |
| |
| static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) |
| { |
| struct mm_struct *mm = vma->vm_mm; |
| int new_ctx = mm->context; |
| |
| /* Sun4c has no separate I/D caches so cannot optimize for non |
| * text page flushes. |
| */ |
| if (new_ctx != NO_CONTEXT) { |
| int octx = sun4c_get_context(); |
| unsigned long flags; |
| |
| flush_user_windows(); |
| local_irq_save(flags); |
| sun4c_set_context(new_ctx); |
| sun4c_flush_page(page); |
| sun4c_set_context(octx); |
| local_irq_restore(flags); |
| } |
| } |
| |
| static void sun4c_flush_page_to_ram(unsigned long page) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| sun4c_flush_page(page); |
| local_irq_restore(flags); |
| } |
| |
| /* Sun4c cache is unified, both instructions and data live there, so |
| * no need to flush the on-stack instructions for new signal handlers. |
| */ |
| static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) |
| { |
| } |
| |
| /* TLB flushing on the sun4c. These routines count on the cache |
| * flushing code to flush the user register windows so that we need |
| * not do so when we get here. |
| */ |
| |
| static void sun4c_flush_tlb_all(void) |
| { |
| struct sun4c_mmu_entry *this_entry, *next_entry; |
| unsigned long flags; |
| int savectx, ctx; |
| |
| local_irq_save(flags); |
| this_entry = sun4c_kernel_ring.ringhd.next; |
| savectx = sun4c_get_context(); |
| flush_user_windows(); |
| while (sun4c_kernel_ring.num_entries) { |
| next_entry = this_entry->next; |
| sun4c_flush_segment(this_entry->vaddr); |
| for (ctx = 0; ctx < num_contexts; ctx++) { |
| sun4c_set_context(ctx); |
| sun4c_put_segmap(this_entry->vaddr, invalid_segment); |
| } |
| free_kernel_entry(this_entry, &sun4c_kernel_ring); |
| this_entry = next_entry; |
| } |
| sun4c_set_context(savectx); |
| local_irq_restore(flags); |
| } |
| |
| static void sun4c_flush_tlb_mm(struct mm_struct *mm) |
| { |
| int new_ctx = mm->context; |
| |
| if (new_ctx != NO_CONTEXT) { |
| struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| if (head->next != head) { |
| struct sun4c_mmu_entry *entry = head->next; |
| int savectx = sun4c_get_context(); |
| |
| sun4c_set_context(new_ctx); |
| sun4c_flush_context(); |
| do { |
| struct sun4c_mmu_entry *next = entry->next; |
| |
| sun4c_user_unmap(entry); |
| free_user_entry(new_ctx, entry); |
| |
| entry = next; |
| } while (entry != head); |
| sun4c_set_context(savectx); |
| } |
| local_irq_restore(flags); |
| } |
| } |
| |
| static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) |
| { |
| struct mm_struct *mm = vma->vm_mm; |
| int new_ctx = mm->context; |
| |
| if (new_ctx != NO_CONTEXT) { |
| struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; |
| struct sun4c_mmu_entry *entry; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| /* See commentary in sun4c_flush_cache_range(). */ |
| for (entry = head->next; |
| (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); |
| entry = entry->next) |
| ; |
| |
| if ((entry != head) && (entry->vaddr < end)) { |
| int octx = sun4c_get_context(); |
| |
| sun4c_set_context(new_ctx); |
| do { |
| struct sun4c_mmu_entry *next = entry->next; |
| |
| sun4c_flush_segment(entry->vaddr); |
| sun4c_user_unmap(entry); |
| free_user_entry(new_ctx, entry); |
| |
| entry = next; |
| } while ((entry != head) && (entry->vaddr < end)); |
| sun4c_set_context(octx); |
| } |
| local_irq_restore(flags); |
| } |
| } |
| |
| static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) |
| { |
| struct mm_struct *mm = vma->vm_mm; |
| int new_ctx = mm->context; |
| |
| if (new_ctx != NO_CONTEXT) { |
| int savectx = sun4c_get_context(); |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| sun4c_set_context(new_ctx); |
| page &= PAGE_MASK; |
| sun4c_flush_page(page); |
| sun4c_put_pte(page, 0); |
| sun4c_set_context(savectx); |
| local_irq_restore(flags); |
| } |
| } |
| |
| static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) |
| { |
| unsigned long page_entry, pg_iobits; |
| |
| pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | |
| _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; |
| |
| page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); |
| page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); |
| sun4c_put_pte(virt_addr, page_entry); |
| } |
| |
| static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, |
| unsigned long xva, unsigned int len) |
| { |
| while (len != 0) { |
| len -= PAGE_SIZE; |
| sun4c_mapioaddr(xpa, xva); |
| xva += PAGE_SIZE; |
| xpa += PAGE_SIZE; |
| } |
| } |
| |
| static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) |
| { |
| while (len != 0) { |
| len -= PAGE_SIZE; |
| sun4c_put_pte(virt_addr, 0); |
| virt_addr += PAGE_SIZE; |
| } |
| } |
| |
| static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) |
| { |
| struct ctx_list *ctxp; |
| |
| ctxp = ctx_free.next; |
| if (ctxp != &ctx_free) { |
| remove_from_ctx_list(ctxp); |
| add_to_used_ctxlist(ctxp); |
| mm->context = ctxp->ctx_number; |
| ctxp->ctx_mm = mm; |
| return; |
| } |
| ctxp = ctx_used.next; |
| if (ctxp->ctx_mm == old_mm) |
| ctxp = ctxp->next; |
| remove_from_ctx_list(ctxp); |
| add_to_used_ctxlist(ctxp); |
| ctxp->ctx_mm->context = NO_CONTEXT; |
| ctxp->ctx_mm = mm; |
| mm->context = ctxp->ctx_number; |
| sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], |
| ctxp->ctx_number); |
| } |
| |
| /* Switch the current MM context. */ |
| static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) |
| { |
| struct ctx_list *ctx; |
| int dirty = 0; |
| |
| if (mm->context == NO_CONTEXT) { |
| dirty = 1; |
| sun4c_alloc_context(old_mm, mm); |
| } else { |
| /* Update the LRU ring of contexts. */ |
| ctx = ctx_list_pool + mm->context; |
| remove_from_ctx_list(ctx); |
| add_to_used_ctxlist(ctx); |
| } |
| if (dirty || old_mm != mm) |
| sun4c_set_context(mm->context); |
| } |
| |
| static void sun4c_destroy_context(struct mm_struct *mm) |
| { |
| struct ctx_list *ctx_old; |
| |
| if (mm->context != NO_CONTEXT) { |
| sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); |
| ctx_old = ctx_list_pool + mm->context; |
| remove_from_ctx_list(ctx_old); |
| add_to_free_ctxlist(ctx_old); |
| mm->context = NO_CONTEXT; |
| } |
| } |
| |
| static void sun4c_mmu_info(struct seq_file *m) |
| { |
| int used_user_entries, i; |
| |
| used_user_entries = 0; |
| for (i = 0; i < num_contexts; i++) |
| used_user_entries += sun4c_context_ring[i].num_entries; |
| |
| seq_printf(m, |
| "vacsize\t\t: %d bytes\n" |
| "vachwflush\t: %s\n" |
| "vaclinesize\t: %d bytes\n" |
| "mmuctxs\t\t: %d\n" |
| "mmupsegs\t: %d\n" |
| "kernelpsegs\t: %d\n" |
| "kfreepsegs\t: %d\n" |
| "usedpsegs\t: %d\n" |
| "ufreepsegs\t: %d\n" |
| "user_taken\t: %d\n" |
| "max_taken\t: %d\n", |
| sun4c_vacinfo.num_bytes, |
| (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), |
| sun4c_vacinfo.linesize, |
| num_contexts, |
| (invalid_segment + 1), |
| sun4c_kernel_ring.num_entries, |
| sun4c_kfree_ring.num_entries, |
| used_user_entries, |
| sun4c_ufree_ring.num_entries, |
| sun4c_user_taken_entries, |
| max_user_taken_entries); |
| } |
| |
| /* Nothing below here should touch the mmu hardware nor the mmu_entry |
| * data structures. |
| */ |
| |
| /* First the functions which the mid-level code uses to directly |
| * manipulate the software page tables. Some defines since we are |
| * emulating the i386 page directory layout. |
| */ |
| #define PGD_PRESENT 0x001 |
| #define PGD_RW 0x002 |
| #define PGD_USER 0x004 |
| #define PGD_ACCESSED 0x020 |
| #define PGD_DIRTY 0x040 |
| #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) |
| |
| static void sun4c_set_pte(pte_t *ptep, pte_t pte) |
| { |
| *ptep = pte; |
| } |
| |
| static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) |
| { |
| } |
| |
| static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) |
| { |
| pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; |
| } |
| |
| static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) |
| { |
| if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ |
| pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); |
| } |
| |
| static int sun4c_pte_present(pte_t pte) |
| { |
| return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); |
| } |
| static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } |
| |
| static int sun4c_pmd_bad(pmd_t pmd) |
| { |
| return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || |
| (!virt_addr_valid(pmd_val(pmd)))); |
| } |
| |
| static int sun4c_pmd_present(pmd_t pmd) |
| { |
| return ((pmd_val(pmd) & PGD_PRESENT) != 0); |
| } |
| |
| #if 0 /* if PMD takes one word */ |
| static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } |
| #else /* if pmd_t is a longish aggregate */ |
| static void sun4c_pmd_clear(pmd_t *pmdp) { |
| memset((void *)pmdp, 0, sizeof(pmd_t)); |
| } |
| #endif |
| |
| static int sun4c_pgd_none(pgd_t pgd) { return 0; } |
| static int sun4c_pgd_bad(pgd_t pgd) { return 0; } |
| static int sun4c_pgd_present(pgd_t pgd) { return 1; } |
| static void sun4c_pgd_clear(pgd_t * pgdp) { } |
| |
| /* |
| * The following only work if pte_present() is true. |
| * Undefined behaviour if not.. |
| */ |
| static pte_t sun4c_pte_mkwrite(pte_t pte) |
| { |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); |
| if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); |
| return pte; |
| } |
| |
| static pte_t sun4c_pte_mkdirty(pte_t pte) |
| { |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); |
| if (pte_val(pte) & _SUN4C_PAGE_WRITE) |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); |
| return pte; |
| } |
| |
| static pte_t sun4c_pte_mkyoung(pte_t pte) |
| { |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); |
| if (pte_val(pte) & _SUN4C_PAGE_READ) |
| pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); |
| return pte; |
| } |
| |
| /* |
| * Conversion functions: convert a page and protection to a page entry, |
| * and a page entry and page directory to the page they refer to. |
| */ |
| static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot) |
| { |
| return __pte(page_to_pfn(page) | pgprot_val(pgprot)); |
| } |
| |
| static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) |
| { |
| return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); |
| } |
| |
| static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) |
| { |
| return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); |
| } |
| |
| static unsigned long sun4c_pte_pfn(pte_t pte) |
| { |
| return pte_val(pte) & SUN4C_PFN_MASK; |
| } |
| |
| static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) |
| { |
| return __pte(pgoff | _SUN4C_PAGE_FILE); |
| } |
| |
| static unsigned long sun4c_pte_to_pgoff(pte_t pte) |
| { |
| return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); |
| } |
| |
| |
| static inline unsigned long sun4c_pmd_page_v(pmd_t pmd) |
| { |
| return (pmd_val(pmd) & PAGE_MASK); |
| } |
| |
| static struct page *sun4c_pmd_page(pmd_t pmd) |
| { |
| return virt_to_page(sun4c_pmd_page_v(pmd)); |
| } |
| |
| static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } |
| |
| /* to find an entry in a page-table-directory */ |
| static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) |
| { |
| return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); |
| } |
| |
| /* Find an entry in the second-level page table.. */ |
| static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) |
| { |
| return (pmd_t *) dir; |
| } |
| |
| /* Find an entry in the third-level page table.. */ |
| pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) |
| { |
| return (pte_t *) sun4c_pmd_page_v(*dir) + |
| ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); |
| } |
| |
| static unsigned long sun4c_swp_type(swp_entry_t entry) |
| { |
| return (entry.val & SUN4C_SWP_TYPE_MASK); |
| } |
| |
| static unsigned long sun4c_swp_offset(swp_entry_t entry) |
| { |
| return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; |
| } |
| |
| static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) |
| { |
| return (swp_entry_t) { |
| (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT |
| | (type & SUN4C_SWP_TYPE_MASK) }; |
| } |
| |
| static void sun4c_free_pte_slow(pte_t *pte) |
| { |
| free_page((unsigned long)pte); |
| } |
| |
| static void sun4c_free_pgd_slow(pgd_t *pgd) |
| { |
| free_page((unsigned long)pgd); |
| } |
| |
| static pgd_t *sun4c_get_pgd_fast(void) |
| { |
| unsigned long *ret; |
| |
| if ((ret = pgd_quicklist) != NULL) { |
| pgd_quicklist = (unsigned long *)(*ret); |
| ret[0] = ret[1]; |
| pgtable_cache_size--; |
| } else { |
| pgd_t *init; |
| |
| ret = (unsigned long *)__get_free_page(GFP_KERNEL); |
| memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); |
| init = sun4c_pgd_offset(&init_mm, 0); |
| memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, |
| (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
| } |
| return (pgd_t *)ret; |
| } |
| |
| static void sun4c_free_pgd_fast(pgd_t *pgd) |
| { |
| *(unsigned long *)pgd = (unsigned long) pgd_quicklist; |
| pgd_quicklist = (unsigned long *) pgd; |
| pgtable_cache_size++; |
| } |
| |
| |
| static inline pte_t * |
| sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) |
| { |
| unsigned long *ret; |
| |
| if ((ret = (unsigned long *)pte_quicklist) != NULL) { |
| pte_quicklist = (unsigned long *)(*ret); |
| ret[0] = ret[1]; |
| pgtable_cache_size--; |
| } |
| return (pte_t *)ret; |
| } |
| |
| static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
| { |
| pte_t *pte; |
| |
| if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) |
| return pte; |
| |
| pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
| return pte; |
| } |
| |
| static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) |
| { |
| pte_t *pte; |
| struct page *page; |
| |
| pte = sun4c_pte_alloc_one_kernel(mm, address); |
| if (pte == NULL) |
| return NULL; |
| page = virt_to_page(pte); |
| pgtable_page_ctor(page); |
| return page; |
| } |
| |
| static inline void sun4c_free_pte_fast(pte_t *pte) |
| { |
| *(unsigned long *)pte = (unsigned long) pte_quicklist; |
| pte_quicklist = (unsigned long *) pte; |
| pgtable_cache_size++; |
| } |
| |
| static void sun4c_pte_free(pgtable_t pte) |
| { |
| pgtable_page_dtor(pte); |
| sun4c_free_pte_fast(page_address(pte)); |
| } |
| |
| /* |
| * allocating and freeing a pmd is trivial: the 1-entry pmd is |
| * inside the pgd, so has no extra memory associated with it. |
| */ |
| static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
| { |
| BUG(); |
| return NULL; |
| } |
| |
| static void sun4c_free_pmd_fast(pmd_t * pmd) { } |
| |
| static void sun4c_check_pgt_cache(int low, int high) |
| { |
| if (pgtable_cache_size > high) { |
| do { |
| if (pgd_quicklist) |
| sun4c_free_pgd_slow(sun4c_get_pgd_fast()); |
| if (pte_quicklist) |
| sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); |
| } while (pgtable_cache_size > low); |
| } |
| } |
| |
| /* An experiment, turn off by default for now... -DaveM */ |
| #define SUN4C_PRELOAD_PSEG |
| |
| void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) |
| { |
| unsigned long flags; |
| int pseg; |
| |
| if (vma->vm_mm->context == NO_CONTEXT) |
| return; |
| |
| local_irq_save(flags); |
| address &= PAGE_MASK; |
| if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { |
| struct sun4c_mmu_entry *entry = sun4c_user_strategy(); |
| struct mm_struct *mm = vma->vm_mm; |
| unsigned long start, end; |
| |
| entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); |
| entry->ctx = mm->context; |
| add_ring_ordered(sun4c_context_ring + mm->context, entry); |
| sun4c_put_segmap(entry->vaddr, entry->pseg); |
| end = start + SUN4C_REAL_PGDIR_SIZE; |
| while (start < end) { |
| #ifdef SUN4C_PRELOAD_PSEG |
| pgd_t *pgdp = sun4c_pgd_offset(mm, start); |
| pte_t *ptep; |
| |
| if (!pgdp) |
| goto no_mapping; |
| ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); |
| if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) |
| goto no_mapping; |
| sun4c_put_pte(start, pte_val(*ptep)); |
| goto next; |
| |
| no_mapping: |
| #endif |
| sun4c_put_pte(start, 0); |
| #ifdef SUN4C_PRELOAD_PSEG |
| next: |
| #endif |
| start += PAGE_SIZE; |
| } |
| #ifndef SUN4C_PRELOAD_PSEG |
| sun4c_put_pte(address, pte_val(*ptep)); |
| #endif |
| local_irq_restore(flags); |
| return; |
| } else { |
| struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; |
| |
| remove_lru(entry); |
| add_lru(entry); |
| } |
| |
| sun4c_put_pte(address, pte_val(*ptep)); |
| local_irq_restore(flags); |
| } |
| |
| extern void sparc_context_init(int); |
| extern unsigned long bootmem_init(unsigned long *pages_avail); |
| extern unsigned long last_valid_pfn; |
| |
| void __init sun4c_paging_init(void) |
| { |
| int i, cnt; |
| unsigned long kernel_end, vaddr; |
| extern struct resource sparc_iomap; |
| unsigned long end_pfn, pages_avail; |
| |
| kernel_end = (unsigned long) &_end; |
| kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); |
| |
| pages_avail = 0; |
| last_valid_pfn = bootmem_init(&pages_avail); |
| end_pfn = last_valid_pfn; |
| |
| sun4c_probe_mmu(); |
| invalid_segment = (num_segmaps - 1); |
| sun4c_init_mmu_entry_pool(); |
| sun4c_init_rings(); |
| sun4c_init_map_kernelprom(kernel_end); |
| sun4c_init_clean_mmu(kernel_end); |
| sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); |
| sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); |
| sun4c_init_lock_area(DVMA_VADDR, DVMA_END); |
| sun4c_init_lock_areas(); |
| sun4c_init_fill_user_ring(); |
| |
| sun4c_set_context(0); |
| memset(swapper_pg_dir, 0, PAGE_SIZE); |
| memset(pg0, 0, PAGE_SIZE); |
| memset(pg1, 0, PAGE_SIZE); |
| memset(pg2, 0, PAGE_SIZE); |
| memset(pg3, 0, PAGE_SIZE); |
| |
| /* Save work later. */ |
| vaddr = VMALLOC_START; |
| swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); |
| vaddr += SUN4C_PGDIR_SIZE; |
| swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); |
| vaddr += SUN4C_PGDIR_SIZE; |
| swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); |
| vaddr += SUN4C_PGDIR_SIZE; |
| swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); |
| sun4c_init_ss2_cache_bug(); |
| sparc_context_init(num_contexts); |
| |
| { |
| unsigned long zones_size[MAX_NR_ZONES]; |
| unsigned long zholes_size[MAX_NR_ZONES]; |
| unsigned long npages; |
| int znum; |
| |
| for (znum = 0; znum < MAX_NR_ZONES; znum++) |
| zones_size[znum] = zholes_size[znum] = 0; |
| |
| npages = max_low_pfn - pfn_base; |
| |
| zones_size[ZONE_DMA] = npages; |
| zholes_size[ZONE_DMA] = npages - pages_avail; |
| |
| npages = highend_pfn - max_low_pfn; |
| zones_size[ZONE_HIGHMEM] = npages; |
| zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); |
| |
| free_area_init_node(0, zones_size, pfn_base, zholes_size); |
| } |
| |
| cnt = 0; |
| for (i = 0; i < num_segmaps; i++) |
| if (mmu_entry_pool[i].locked) |
| cnt++; |
| |
| max_user_taken_entries = num_segmaps - cnt - 40 - 1; |
| |
| printk("SUN4C: %d mmu entries for the kernel\n", cnt); |
| } |
| |
| static pgprot_t sun4c_pgprot_noncached(pgprot_t prot) |
| { |
| prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE); |
| |
| return prot; |
| } |
| |
| /* Load up routines and constants for sun4c mmu */ |
| void __init ld_mmu_sun4c(void) |
| { |
| extern void ___xchg32_sun4c(void); |
| |
| printk("Loading sun4c MMU routines\n"); |
| |
| /* First the constants */ |
| BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); |
| BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); |
| BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); |
| |
| BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); |
| BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); |
| BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); |
| |
| BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); |
| PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED); |
| BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); |
| BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); |
| BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); |
| page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); |
| |
| /* Functions */ |
| BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); |
| |
| if (sun4c_vacinfo.do_hwflushes) { |
| BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); |
| } else { |
| BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); |
| } |
| |
| BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); |
| |
| BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); |
| |
| /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */ |
| /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */ |
| |
| BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); |
| #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ |
| BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); |
| #else |
| BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); |
| #endif |
| BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); |
| |
| BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); |
| |
| BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); |
| BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); |
| BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); |
| BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); |
| |
| BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); |
| BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); |
| BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); |
| BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); |
| BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); |
| BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); |
| BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); |
| BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); |
| BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); |
| BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); |
| BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); |
| BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); |
| |
| BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); |
| |
| /* These should _never_ get called with two level tables. */ |
| BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); |
| BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0); |
| } |