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[POWERPC] Setup the boot cpu's paca pointer in C rather than asm 

There's no need to set the boot cpu paca in asm, so do it in C so us
mere mortals can understand it.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
hifive-unleashed-5.1
Michael Ellerman 2006-06-23 18:20:09 +10:00 committed by Paul Mackerras
parent aa98c50dcb
commit 4ba99b97da
2 changed files with 8 additions and 12 deletions
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11
arch/powerpc/kernel/head_64.S
View File

@ -1976,17 +1976,6 @@ _STATIC(start_here_common)
/* Not reached */
BUG_OPCODE
/* Put the paca pointer into r13 and SPRG3 */
_GLOBAL(setup_boot_paca)
LOAD_REG_IMMEDIATE(r3, boot_cpuid)
lwz r3,0(r3)
LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */
mulli r3,r3,PACA_SIZE /* Calculate vaddr of right paca */
add r13,r3,r4 /* for this processor. */
mtspr SPRN_SPRG3,r13
blr
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the bss, which is page-aligned.

9
arch/powerpc/kernel/setup_64.c
View File

@ -149,6 +149,13 @@ early_param("smt-enabled", early_smt_enabled);
#define check_smt_enabled()
#endif /* CONFIG_SMP */
/* Put the paca pointer into r13 and SPRG3 */
void __init setup_paca(int cpu)
{
local_paca = &paca[cpu];
mtspr(SPRN_SPRG3, local_paca);
}
/*
* Early initialization entry point. This is called by head.S
* with MMU translation disabled. We rely on the "feature" of
@ -183,7 +190,7 @@ void __init early_setup(unsigned long dt_ptr)
early_init_devtree(__va(dt_ptr));
/* Now we know the logical id of our boot cpu, setup the paca. */
setup_boot_paca();
setup_paca(boot_cpuid);
/* Fix up paca fields required for the boot cpu */
get_paca()->cpu_start = 1;