xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] powerpc: Create a trampoline for the fwnmi vectors

Browse Source 
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>
This commit is contained in:
Michael Ellerman
2005-12-04 18:39:33 +11:00
committed by Paul Mackerras
parent 398ab1fcb9
commit 8c4f1f2958
4 changed files with 20 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
arch/powerpc/platforms/pseries/setup.c
View File

@@ -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;
}