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Enforce that 'pmap_kenter()' is only used to establish cacheable mappings.

Browse source 
Mappings with other cacheability attributes can be established, if needed,
by using 'pmap_kenter_attr()'.

Suggested by:	jchandra, imp
This commit is contained in:
Neel Natu 2010-09-22 02:26:07 +00:00
parent 87b6f1855b
commit 5df4b6be91
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212989
3 changed files with 6 additions and 8 deletions
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1
sys/mips/include/pmap.h
View file

@ -154,6 +154,7 @@ void pmap_unmapdev(vm_offset_t, vm_size_t);
vm_offset_t pmap_steal_memory(vm_size_t size);
int page_is_managed(vm_offset_t pa);
void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr);
void pmap_kremove(vm_offset_t va);
void *pmap_kenter_temporary(vm_paddr_t pa, int i);
void pmap_kenter_temporary_free(vm_paddr_t pa);

11
sys/mips/mips/pmap.c
View file

@ -828,7 +828,7 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
/*
* add a wired page to the kva
*/
static void
void
pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr)
{
pt_entry_t *pte;
@ -849,14 +849,11 @@ pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr)
void
pmap_kenter(vm_offset_t va, vm_paddr_t pa)
{
int attr;
if (is_cacheable_mem(pa))
attr = PTE_C_CACHE;
else
attr = PTE_C_UNCACHED;
KASSERT(is_cacheable_mem(pa),
("pmap_kenter: memory at 0x%lx is not cacheable", (u_long)pa));
pmap_kenter_attr(va, pa, attr);
pmap_kenter_attr(va, pa, PTE_C_CACHE);
}
/*

2
sys/mips/sibyte/sb_zbpci.c
View file

@ -349,7 +349,7 @@ zbpci_config_space_va(int bus, int slot, int func, int reg, int bytes)
pa_page = pa & ~(PAGE_SIZE - 1);
if (zbpci_config_space[cpu].paddr != pa_page) {
pmap_kremove(va_page);
pmap_kenter(va_page, pa_page);
pmap_kenter_attr(va_page, pa_page, PTE_C_UNCACHED);
zbpci_config_space[cpu].paddr = pa_page;
}
return (va_page + (pa - pa_page));