diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2005-12-04 18:39:33 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-01-09 14:52:17 +1100 |
| commit | 8c4f1f2958ff9d4a6760f3bdd0cfb7d2b9e12093 (patch) | |
| tree | 3616f75215bc397725cd86708862d358d2e10d4c /arch | |
| parent | 398ab1fcb960ea0800f40a9c36355855e3e23389 (diff) | |
[PATCH] powerpc: Create a trampoline for the fwnmi vectors
The fwnmi vectors can be anywhere < 32 MB, so we need to use a trampoline
for them. The kdump kernel will register the trampoline addresses, which will
then jump up to the real code above 32 MB.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/ras.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 18 |
3 files changed, 14 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 65aedc938a6..f4194f5fd2e 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -553,6 +553,7 @@ slb_miss_user_pseries: * Vectors for the FWNMI option. Share common code. */ .globl system_reset_fwnmi + .align 7 system_reset_fwnmi: HMT_MEDIUM mtspr SPRN_SPRG1,r13 /* save r13 */ @@ -560,6 +561,7 @@ system_reset_fwnmi: EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common) .globl machine_check_fwnmi + .align 7 machine_check_fwnmi: HMT_MEDIUM mtspr SPRN_SPRG1,r13 /* save r13 */ diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c index fbd214d68b0..49b305f9c15 100644 --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -49,14 +49,12 @@ #include <asm/machdep.h> #include <asm/rtas.h> #include <asm/udbg.h> +#include <asm/firmware.h> static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX]; static DEFINE_SPINLOCK(ras_log_buf_lock); -char mce_data_buf[RTAS_ERROR_LOG_MAX] -; -/* This is true if we are using the firmware NMI handler (typically LPAR) */ -extern int fwnmi_active; +char mce_data_buf[RTAS_ERROR_LOG_MAX]; static int ras_get_sensor_state_token; static int ras_check_exception_token; diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 8828dc378c3..d678f228fc0 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -77,8 +77,6 @@ #endif extern void find_udbg_vterm(void); -extern void system_reset_fwnmi(void); /* from head.S */ -extern void machine_check_fwnmi(void); /* from head.S */ int fwnmi_active; /* TRUE if an FWNMI handler is present */ @@ -104,18 +102,22 @@ void pSeries_show_cpuinfo(struct seq_file *m) /* Initialize firmware assisted non-maskable interrupts if * the firmware supports this feature. - * */ static void __init fwnmi_init(void) { - int ret; + unsigned long system_reset_addr, machine_check_addr; + int ibm_nmi_register = rtas_token("ibm,nmi-register"); if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) return; - ret = rtas_call(ibm_nmi_register, 2, 1, NULL, - __pa((unsigned long)system_reset_fwnmi), - __pa((unsigned long)machine_check_fwnmi)); - if (ret == 0) + + /* If the kernel's not linked at zero we point the firmware at low + * addresses anyway, and use a trampoline to get to the real code. */ + system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; + machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; + + if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, + machine_check_addr)) fwnmi_active = 1; } |