[SPARC64]: Move over to sparsemem.
This has been pending for a long time, and the fact
that we waste a ton of ram on some configurations
kind of pushed things over the edge.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 4c0a50a..a253a39 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -186,6 +186,12 @@
endmenu
+config ARCH_SPARSEMEM_ENABLE
+ def_bool y
+
+config ARCH_SPARSEMEM_DEFAULT
+ def_bool y
+
source "mm/Kconfig"
config GENERIC_ISA_DMA
diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index e87fe7d..9914a17 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -95,9 +95,6 @@
extern int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs);
-extern unsigned long phys_base;
-extern unsigned long pfn_base;
-
extern unsigned int sys_call_table[];
extern void xor_vis_2(unsigned long, unsigned long *, unsigned long *);
@@ -346,11 +343,7 @@
EXPORT_SYMBOL(__clear_user);
/* Various address conversion macros use this. */
-EXPORT_SYMBOL(phys_base);
-EXPORT_SYMBOL(pfn_base);
EXPORT_SYMBOL(sparc64_valid_addr_bitmap);
-EXPORT_SYMBOL(page_to_pfn);
-EXPORT_SYMBOL(pfn_to_page);
/* No version information on this, heavily used in inline asm,
* and will always be 'void __ret_efault(void)'.
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index a639393..5f67b53 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -130,11 +130,9 @@
unsigned long *sparc64_valid_addr_bitmap __read_mostly;
-/* Ugly, but necessary... -DaveM */
-unsigned long phys_base __read_mostly;
+/* Kernel physical address base and size in bytes. */
unsigned long kern_base __read_mostly;
unsigned long kern_size __read_mostly;
-unsigned long pfn_base __read_mostly;
/* get_new_mmu_context() uses "cache + 1". */
DEFINE_SPINLOCK(ctx_alloc_lock);
@@ -368,16 +366,6 @@
}
}
-unsigned long page_to_pfn(struct page *page)
-{
- return (unsigned long) ((page - mem_map) + pfn_base);
-}
-
-struct page *pfn_to_page(unsigned long pfn)
-{
- return (mem_map + (pfn - pfn_base));
-}
-
void show_mem(void)
{
printk("Mem-info:\n");
@@ -773,9 +761,78 @@
extern unsigned long cmdline_memory_size;
-unsigned long __init bootmem_init(unsigned long *pages_avail)
+/* Find a free area for the bootmem map, avoiding the kernel image
+ * and the initial ramdisk.
+ */
+static unsigned long __init choose_bootmap_pfn(unsigned long start_pfn,
+ unsigned long end_pfn)
{
- unsigned long bootmap_size, start_pfn, end_pfn;
+ unsigned long avoid_start, avoid_end, bootmap_size;
+ int i;
+
+ bootmap_size = ((end_pfn - start_pfn) + 7) / 8;
+ bootmap_size = ALIGN(bootmap_size, sizeof(long));
+
+ avoid_start = avoid_end = 0;
+#ifdef CONFIG_BLK_DEV_INITRD
+ avoid_start = initrd_start;
+ avoid_end = PAGE_ALIGN(initrd_end);
+#endif
+
+#ifdef CONFIG_DEBUG_BOOTMEM
+ prom_printf("choose_bootmap_pfn: kern[%lx:%lx] avoid[%lx:%lx]\n",
+ kern_base, PAGE_ALIGN(kern_base + kern_size),
+ avoid_start, avoid_end);
+#endif
+ for (i = 0; i < pavail_ents; i++) {
+ unsigned long start, end;
+
+ start = pavail[i].phys_addr;
+ end = start + pavail[i].reg_size;
+
+ while (start < end) {
+ if (start >= kern_base &&
+ start < PAGE_ALIGN(kern_base + kern_size)) {
+ start = PAGE_ALIGN(kern_base + kern_size);
+ continue;
+ }
+ if (start >= avoid_start && start < avoid_end) {
+ start = avoid_end;
+ continue;
+ }
+
+ if ((end - start) < bootmap_size)
+ break;
+
+ if (start < kern_base &&
+ (start + bootmap_size) > kern_base) {
+ start = PAGE_ALIGN(kern_base + kern_size);
+ continue;
+ }
+
+ if (start < avoid_start &&
+ (start + bootmap_size) > avoid_start) {
+ start = avoid_end;
+ continue;
+ }
+
+ /* OK, it doesn't overlap anything, use it. */
+#ifdef CONFIG_DEBUG_BOOTMEM
+ prom_printf("choose_bootmap_pfn: Using %lx [%lx]\n",
+ start >> PAGE_SHIFT, start);
+#endif
+ return start >> PAGE_SHIFT;
+ }
+ }
+
+ prom_printf("Cannot find free area for bootmap, aborting.\n");
+ prom_halt();
+}
+
+static unsigned long __init bootmem_init(unsigned long *pages_avail,
+ unsigned long phys_base)
+{
+ unsigned long bootmap_size, end_pfn;
unsigned long end_of_phys_memory = 0UL;
unsigned long bootmap_pfn, bytes_avail, size;
int i;
@@ -813,14 +870,6 @@
*pages_avail = bytes_avail >> PAGE_SHIFT;
- /* Start with page aligned address of last symbol in kernel
- * image. The kernel is hard mapped below PAGE_OFFSET in a
- * 4MB locked TLB translation.
- */
- start_pfn = PAGE_ALIGN(kern_base + kern_size) >> PAGE_SHIFT;
-
- bootmap_pfn = start_pfn;
-
end_pfn = end_of_phys_memory >> PAGE_SHIFT;
#ifdef CONFIG_BLK_DEV_INITRD
@@ -837,23 +886,23 @@
"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
initrd_end, end_of_phys_memory);
initrd_start = 0;
- }
- if (initrd_start) {
- if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
- initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
- bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
+ initrd_end = 0;
}
}
#endif
/* Initialize the boot-time allocator. */
max_pfn = max_low_pfn = end_pfn;
- min_low_pfn = pfn_base;
+ min_low_pfn = (phys_base >> PAGE_SHIFT);
+
+ bootmap_pfn = choose_bootmap_pfn(min_low_pfn, end_pfn);
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n",
min_low_pfn, bootmap_pfn, max_low_pfn);
#endif
- bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, end_pfn);
+ bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn,
+ (phys_base >> PAGE_SHIFT),
+ end_pfn);
/* Now register the available physical memory with the
* allocator.
@@ -901,6 +950,20 @@
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
+ for (i = 0; i < pavail_ents; i++) {
+ unsigned long start_pfn, end_pfn;
+
+ start_pfn = pavail[i].phys_addr >> PAGE_SHIFT;
+ end_pfn = (start_pfn + (pavail[i].reg_size >> PAGE_SHIFT));
+#ifdef CONFIG_DEBUG_BOOTMEM
+ prom_printf("memory_present(0, %lx, %lx)\n",
+ start_pfn, end_pfn);
+#endif
+ memory_present(0, start_pfn, end_pfn);
+ }
+
+ sparse_init();
+
return end_pfn;
}
@@ -1180,7 +1243,7 @@
void __init paging_init(void)
{
- unsigned long end_pfn, pages_avail, shift;
+ unsigned long end_pfn, pages_avail, shift, phys_base;
unsigned long real_end, i;
kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
@@ -1211,8 +1274,6 @@
for (i = 0; i < pavail_ents; i++)
phys_base = min(phys_base, pavail[i].phys_addr);
- pfn_base = phys_base >> PAGE_SHIFT;
-
set_bit(0, mmu_context_bmap);
shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
@@ -1248,7 +1309,9 @@
/* Setup bootmem... */
pages_avail = 0;
- last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
+ last_valid_pfn = end_pfn = bootmem_init(&pages_avail, phys_base);
+
+ max_mapnr = last_valid_pfn - (phys_base >> PAGE_SHIFT);
kernel_physical_mapping_init();
@@ -1261,7 +1324,7 @@
for (znum = 0; znum < MAX_NR_ZONES; znum++)
zones_size[znum] = zholes_size[znum] = 0;
- npages = end_pfn - pfn_base;
+ npages = end_pfn - (phys_base >> PAGE_SHIFT);
zones_size[ZONE_DMA] = npages;
zholes_size[ZONE_DMA] = npages - pages_avail;
@@ -1336,7 +1399,6 @@
taint_real_pages();
- max_mapnr = last_valid_pfn - pfn_base;
high_memory = __va(last_valid_pfn << PAGE_SHIFT);
#ifdef CONFIG_DEBUG_BOOTMEM
diff --git a/include/asm-sparc64/numnodes.h b/include/asm-sparc64/numnodes.h
new file mode 100644
index 0000000..017e7e7
--- /dev/null
+++ b/include/asm-sparc64/numnodes.h
@@ -0,0 +1,6 @@
+#ifndef _SPARC64_NUMNODES_H
+#define _SPARC64_NUMNODES_H
+
+#define NODES_SHIFT 0
+
+#endif /* !(_SPARC64_NUMNODES_H) */
diff --git a/include/asm-sparc64/page.h b/include/asm-sparc64/page.h
index c277ac5..f6b4925 100644
--- a/include/asm-sparc64/page.h
+++ b/include/asm-sparc64/page.h
@@ -125,17 +125,10 @@
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
-/* PFNs are real physical page numbers. However, mem_map only begins to record
- * per-page information starting at pfn_base. This is to handle systems where
- * the first physical page in the machine is at some huge physical address,
- * such as 4GB. This is common on a partitioned E10000, for example.
- */
-extern struct page *pfn_to_page(unsigned long pfn);
-extern unsigned long page_to_pfn(struct page *);
+#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
-#define pfn_valid(pfn) (((pfn)-(pfn_base)) < max_mapnr)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define virt_to_phys __pa
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
index 75a2cd2..d427ce6 100644
--- a/include/asm-sparc64/pgtable.h
+++ b/include/asm-sparc64/pgtable.h
@@ -217,9 +217,6 @@
extern unsigned long _PAGE_ALL_SZ_BITS;
extern unsigned long _PAGE_SZBITS;
-extern unsigned long phys_base;
-extern unsigned long pfn_base;
-
extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr) (mem_map_zero)
diff --git a/include/asm-sparc64/sparsemem.h b/include/asm-sparc64/sparsemem.h
new file mode 100644
index 0000000..ed5c9d8
--- /dev/null
+++ b/include/asm-sparc64/sparsemem.h
@@ -0,0 +1,12 @@
+#ifndef _SPARC64_SPARSEMEM_H
+#define _SPARC64_SPARSEMEM_H
+
+#ifdef __KERNEL__
+
+#define SECTION_SIZE_BITS 26
+#define MAX_PHYSADDR_BITS 42
+#define MAX_PHYSMEM_BITS 42
+
+#endif /* !(__KERNEL__) */
+
+#endif /* !(_SPARC64_SPARSEMEM_H) */