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Fix boot-time hang/panic on G3 systems when modifying IBAT0 in

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pmap_bootstrap by using the sync;isync big hammer to make sure
all prior operations have completed.

Reported by:	Nathan Whitehorn <nathan at uchicago edu>
MFC after:	2 days
This commit is contained in:
Peter Grehan 2005-09-10 21:03:10 +00:00
parent a8f01390e1
commit 72ed31087b
3 changed files with 6 additions and 3 deletions
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3
sys/powerpc/aim/mmu_oea.c
View File

@ -569,7 +569,8 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
*/
batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
__asm ("mtibatu 0,%0; mtibatl 0,%1; isync; \n"
__asm ("sync; isync; \n"
"mtibatu 0,%0; mtibatl 0,%1; isync; \n"
"mtdbatu 0,%0; mtdbatl 0,%1; isync"
:: "r"(batu), "r"(batl));

3
sys/powerpc/powerpc/mmu_oea.c
View File

@ -569,7 +569,8 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
*/
batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
__asm ("mtibatu 0,%0; mtibatl 0,%1; isync; \n"
__asm ("sync; isync; \n"
"mtibatu 0,%0; mtibatl 0,%1; isync; \n"
"mtdbatu 0,%0; mtdbatl 0,%1; isync"
:: "r"(batu), "r"(batl));

3
sys/powerpc/powerpc/pmap.c
View File

@ -569,7 +569,8 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
*/
batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
__asm ("mtibatu 0,%0; mtibatl 0,%1; isync; \n"
__asm ("sync; isync; \n"
"mtibatu 0,%0; mtibatl 0,%1; isync; \n"
"mtdbatu 0,%0; mtdbatl 0,%1; isync"
:: "r"(batu), "r"(batl));