Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code
Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like
In this patch, we provide SMP extend to Blackfin header files
and machine common code
Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index c6ae844..5531f49 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -36,6 +36,7 @@
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/unistd.h>
+#include <linux/threads.h>
#include <asm/blackfin.h>
#include <asm/errno.h>
#include <asm/fixed_code.h>
@@ -75,11 +76,11 @@
* handle it.
*/
P4 = R7; /* Store EXCAUSE */
- p5.l = _last_cplb_fault_retx;
- p5.h = _last_cplb_fault_retx;
- r7 = [p5];
+
+ GET_PDA(p5, r7);
+ r7 = [p5 + PDA_LFRETX];
r6 = retx;
- [p5] = r6;
+ [p5 + PDA_LFRETX] = r6;
cc = r6 == r7;
if !cc jump _bfin_return_from_exception;
/* fall through */
@@ -324,7 +325,9 @@
[p4] = p5;
csync;
+ GET_PDA(p5, r6);
#ifndef CONFIG_DEBUG_DOUBLEFAULT
+
/*
* Save these registers, as they are only valid in exception context
* (where we are now - as soon as we defer to IRQ5, they can change)
@@ -335,29 +338,25 @@
p4.l = lo(DCPLB_FAULT_ADDR);
p4.h = hi(DCPLB_FAULT_ADDR);
r7 = [p4];
- p5.h = _saved_dcplb_fault_addr;
- p5.l = _saved_dcplb_fault_addr;
- [p5] = r7;
+ [p5 + PDA_DCPLB] = r7;
- r7 = [p4 + (ICPLB_FAULT_ADDR - DCPLB_FAULT_ADDR)];
- p5.h = _saved_icplb_fault_addr;
- p5.l = _saved_icplb_fault_addr;
- [p5] = r7;
+ p4.l = lo(ICPLB_FAULT_ADDR);
+ p4.h = hi(ICPLB_FAULT_ADDR);
+ r6 = [p4];
+ [p5 + PDA_ICPLB] = r6;
r6 = retx;
- p4.l = _saved_retx;
- p4.h = _saved_retx;
- [p4] = r6;
+ [p5 + PDA_RETX] = r6;
#endif
r6 = SYSCFG;
- [p4 + 4] = r6;
+ [p5 + PDA_SYSCFG] = r6;
BITCLR(r6, 0);
SYSCFG = r6;
/* Disable all interrupts, but make sure level 5 is enabled so
* we can switch to that level. Save the old mask. */
cli r6;
- [p4 + 8] = r6;
+ [p5 + PDA_EXIMASK] = r6;
p4.l = lo(SAFE_USER_INSTRUCTION);
p4.h = hi(SAFE_USER_INSTRUCTION);
@@ -424,17 +423,16 @@
ENTRY(_exception_to_level5)
SAVE_ALL_SYS
- p4.l = _saved_retx;
- p4.h = _saved_retx;
- r6 = [p4];
+ GET_PDA(p4, r7); /* Fetch current PDA */
+ r6 = [p4 + PDA_RETX];
[sp + PT_PC] = r6;
- r6 = [p4 + 4];
+ r6 = [p4 + PDA_SYSCFG];
[sp + PT_SYSCFG] = r6;
/* Restore interrupt mask. We haven't pushed RETI, so this
* doesn't enable interrupts until we return from this handler. */
- r6 = [p4 + 8];
+ r6 = [p4 + PDA_EXIMASK];
sti r6;
/* Restore the hardware error vector. */
@@ -478,8 +476,8 @@
* scratch register (for want of a better option).
*/
EX_SCRATCH_REG = sp;
- sp.l = _exception_stack_top;
- sp.h = _exception_stack_top;
+ GET_PDA_SAFE(sp);
+ sp = [sp + PDA_EXSTACK]
/* Try to deal with syscalls quickly. */
[--sp] = ASTAT;
[--sp] = (R7:6,P5:4);
@@ -501,27 +499,22 @@
* but they are not very interesting, so don't save them
*/
+ GET_PDA(p5, r7);
p4.l = lo(DCPLB_FAULT_ADDR);
p4.h = hi(DCPLB_FAULT_ADDR);
r7 = [p4];
- p5.h = _saved_dcplb_fault_addr;
- p5.l = _saved_dcplb_fault_addr;
- [p5] = r7;
+ [p5 + PDA_DCPLB] = r7;
- r7 = [p4 + (ICPLB_FAULT_ADDR - DCPLB_FAULT_ADDR)];
- p5.h = _saved_icplb_fault_addr;
- p5.l = _saved_icplb_fault_addr;
- [p5] = r7;
+ p4.l = lo(ICPLB_FAULT_ADDR);
+ p4.h = hi(ICPLB_FAULT_ADDR);
+ r7 = [p4];
+ [p5 + PDA_ICPLB] = r7;
- p4.l = _saved_retx;
- p4.h = _saved_retx;
r6 = retx;
- [p4] = r6;
+ [p5 + PDA_RETX] = r6;
r7 = SEQSTAT; /* reason code is in bit 5:0 */
- p4.l = _saved_seqstat;
- p4.h = _saved_seqstat;
- [p4] = r7;
+ [p5 + PDA_SEQSTAT] = r7;
#else
r7 = SEQSTAT; /* reason code is in bit 5:0 */
#endif
@@ -546,11 +539,11 @@
p0 = sp;
r3 = SIZEOF_PTREGS / 4;
r4 = 0(x);
-0:
+.Lclear_regs:
[p0++] = r4;
r3 += -1;
cc = r3 == 0;
- if !cc jump 0b (bp);
+ if !cc jump .Lclear_regs (bp);
p0 = sp;
sp += -16;
@@ -558,7 +551,7 @@
call _do_execve;
SP += 16;
cc = r0 == 0;
- if ! cc jump 1f;
+ if ! cc jump .Lexecve_failed;
/* Success. Copy our temporary pt_regs to the top of the kernel
* stack and do a normal exception return.
*/
@@ -574,12 +567,12 @@
p0 = fp;
r4 = [p0--];
r3 = SIZEOF_PTREGS / 4;
-0:
+.Lcopy_regs:
r4 = [p0--];
[p1--] = r4;
r3 += -1;
cc = r3 == 0;
- if ! cc jump 0b (bp);
+ if ! cc jump .Lcopy_regs (bp);
r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
p1 = r0;
@@ -591,7 +584,7 @@
RESTORE_CONTEXT;
rti;
-1:
+.Lexecve_failed:
unlink;
rts;
ENDPROC(_kernel_execve)
@@ -925,9 +918,14 @@
p1 = rets;
[sp + PT_RESERVED] = p1;
+#ifdef CONFIG_SMP
+ GET_PDA(p0, r0); /* Fetch current PDA (can't migrate to other CPU here) */
+ r0 = [p0 + PDA_IRQFLAGS];
+#else
p0.l = _irq_flags;
p0.h = _irq_flags;
r0 = [p0];
+#endif
sti r0;
r0 = sp;
@@ -1539,12 +1537,6 @@
.endr
END(_sys_call_table)
-#if ANOMALY_05000261
-/* Used by the assembly entry point to work around an anomaly. */
-_last_cplb_fault_retx:
- .long 0;
-#endif
-
#ifdef CONFIG_EXCEPTION_L1_SCRATCH
/* .section .l1.bss.scratch */
.set _exception_stack_top, L1_SCRATCH_START + L1_SCRATCH_LENGTH
@@ -1554,8 +1546,8 @@
#else
.bss
#endif
-_exception_stack:
- .rept 1024
+ENTRY(_exception_stack)
+ .rept 1024 * NR_CPUS
.long 0
.endr
_exception_stack_top: