diff options
Diffstat (limited to 'asm/head.S')
| -rw-r--r-- | asm/head.S | 22 |
1 files changed, 18 insertions, 4 deletions
@@ -30,12 +30,17 @@ #define PPC_INST_STOP .long 0x4c0002e4 -#define GET_STACK(stack_reg,pir_reg) \ - sldi stack_reg,pir_reg,STACK_SHIFT; \ - addis stack_reg,stack_reg,CPU_STACKS_OFFSET@ha; \ +#define GET_STACK(stack_reg,pir_reg) \ + sldi stack_reg,pir_reg,STACK_SHIFT; \ + addis stack_reg,stack_reg,CPU_STACKS_OFFSET@ha; \ addi stack_reg,stack_reg,CPU_STACKS_OFFSET@l; -#define GET_CPU() \ +#define GET_EMERGENCY_STACK(stack_reg,pir_reg) \ + sldi stack_reg,pir_reg,STACK_SHIFT; \ + addis stack_reg,stack_reg,EMERGENCY_CPU_STACKS_OFFSET@ha; \ + addi stack_reg,stack_reg,EMERGENCY_CPU_STACKS_OFFSET@l; + +#define GET_CPU() \ clrrdi %r13,%r1,STACK_SHIFT #define SAVE_GPR(reg,sp) std %r##reg,STACK_GPR##reg(sp) @@ -1013,8 +1018,17 @@ opal_entry: b 1b 4: /* Quiesce protocol done, get our per CPU stack */ + /* Emergency stack if we have re-entered OPAL */ + lwz %r11,CPUTHREAD_IN_OPAL_CALL(%r12) + cmpwi %r11,1 + mfspr %r12,SPR_PIR + beq 5f GET_STACK(%r12,%r12) + b 6f +5: + GET_EMERGENCY_STACK(%r12,%r12) +6: stdu %r12,-STACK_FRAMESIZE(%r12) /* Save caller r1, establish new r1 */ |
