[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>

4 files changed, 20 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 65aedc938a6e..f4194f5fd2e5 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 fbd214d68b07..49b305f9c152 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 8828dc378c3e..d678f228fc0f 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;
 }
 
diff --git a/include/asm-powerpc/firmware.h b/include/asm-powerpc/firmware.h
index 12fabbcb04f0..f804b34cf06a 100644
--- a/include/asm-powerpc/firmware.h
+++ b/include/asm-powerpc/firmware.h
@@ -98,6 +98,12 @@ 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 */