[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>

2 files changed, 8 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index be5560a2e441..da0924293496 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -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.
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index cc26530145db..a2fb2e627aad 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -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;