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sparc32: Implement hard_smp_processor_id() via instruction patching.

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This is the last non-trivial user of btfixup.

Like sparc64, use a special patch section to resolve the various
implementations of how to read the current CPU's ID when we don't
have current_thread_info()->cpu necessarily available.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
David S. Miller 2012-05-13 23:09:04 -07:00
parent 5d83d66635
commit c68e5d39a5
10 changed files with 99 additions and 175 deletions
Download patch file Download diff file Expand all files Collapse all files

29
arch/sparc/kernel/leon_smp.c
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@ -73,7 +73,7 @@ static inline unsigned long do_swap(volatile unsigned long *ptr,
void __cpuinit leon_callin(void)
{
int cpuid = hard_smpleon_processor_id();
int cpuid = hard_smp_processor_id();
local_ops->cache_all();
local_ops->tlb_all();
@ -491,39 +491,12 @@ void leon_cross_call_irq(void)
ccall_info.processors_out[i] = 1;
}
void __init leon_blackbox_id(unsigned *addr)
{
int rd = *addr & 0x3e000000;
int rs1 = rd >> 11;
/* patch places where ___b_hard_smp_processor_id appears */
addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
addr[2] = 0x01000000; /* nop */
}
void __init leon_blackbox_current(unsigned *addr)
{
int rd = *addr & 0x3e000000;
int rs1 = rd >> 11;
/* patch LOAD_CURRENT macro where ___b_load_current appears */
addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */
}
void __init leon_init_smp(void)
{
/* Patch ipi15 trap table */
t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM);