[PATCH 4/12] powerpc: Create a trampoline for the fwnmi vectors
Michael Ellerman
michael at ellerman.id.au
Tue Nov 8 00:06:55 EST 2005
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.
arch/powerpc/kernel/head_64.S | 2 ++
arch/powerpc/platforms/pseries/ras.c | 6 ++----
arch/powerpc/platforms/pseries/setup.c | 17 +++++++++--------
include/asm-powerpc/firmware.h | 6 ++++++
4 files changed, 19 insertions(+), 12 deletions(-)
Index: kexec/arch/powerpc/kernel/head_64.S
===================================================================
--- kexec.orig/arch/powerpc/kernel/head_64.S
+++ kexec/arch/powerpc/kernel/head_64.S
@@ -512,6 +512,7 @@ _GLOBAL(do_stab_bolted_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 */
@@ -519,6 +520,7 @@ 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 */
Index: kexec/arch/powerpc/platforms/pseries/setup.c
===================================================================
--- kexec.orig/arch/powerpc/platforms/pseries/setup.c
+++ kexec/arch/powerpc/platforms/pseries/setup.c
@@ -75,8 +75,6 @@
#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 */
extern void generic_find_legacy_serial_ports(u64 *physport,
unsigned int *default_speed);
@@ -104,18 +102,21 @@ void pSeries_show_cpuinfo(struct seq_fil
/* Initialize firmware assisted non-maskable interrupts if
* the firmware supports this feature.
- *
*/
static void __init fwnmi_init(void)
{
- int ret;
+ unsigned long a1, a2;
+
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. */
+ a1 = __pa(system_reset_fwnmi) - PHYSICAL_START;
+ a2 = __pa(machine_check_fwnmi) - PHYSICAL_START;
+
+ if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, a1, a2))
fwnmi_active = 1;
}
Index: kexec/include/asm-powerpc/firmware.h
===================================================================
--- kexec.orig/include/asm-powerpc/firmware.h
+++ kexec/include/asm-powerpc/firmware.h
@@ -92,6 +92,12 @@ typedef struct {
extern firmware_feature_t firmware_features_table[];
#endif
+extern void system_reset_fwnmi(void);
+extern void machine_check_fwnmi(void);
+
+/* This is true if we are using the firmware NMI handler (typically LPAR) */
+extern int fwnmi_active;
+
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_FIRMWARE_H */
Index: kexec/arch/powerpc/platforms/pseries/ras.c
===================================================================
--- kexec.orig/arch/powerpc/platforms/pseries/ras.c
+++ kexec/arch/powerpc/platforms/pseries/ras.c
@@ -49,14 +49,12 @@
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/ppcdebug.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;
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