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The rest of the r5641 commit

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This commit is contained in:
Tomas Hruby 2009-11-11 17:02:45 +00:00
parent 04db2d7184
commit f98bea8f67
1 changed files with 58 additions and 1 deletions
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59
servers/vm/i386/pagetable.c
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@ -60,6 +60,15 @@ PRIVATE struct {
u32_t phys;
} sparepages[SPAREPAGES];
#define MAX_KERNMAPPINGS 10
PRIVATE struct {
phys_bytes phys_addr; /* Physical addr. */
phys_bytes len; /* Length in bytes. */
vir_bytes lin_addr; /* Offset in page table. */
int flags;
} kern_mappings[MAX_KERNMAPPINGS];
int kernmappings = 0;
/* Clicks must be pages, as
* - they must be page aligned to map them
* - they must be a multiple of the page size
@ -758,6 +767,44 @@ PUBLIC void pt_init(void)
/* Let other functions know VM now has a private page table. */
vmp->vm_flags |= VMF_HASPT;
/* Now reserve another pde for kernel's own mappings. */
{
int kernmap_pde;
phys_bytes addr, len;
int flags, index;
u32_t offset = 0;
kernmap_pde = free_pde++;
offset = kernmap_pde * I386_BIG_PAGE_SIZE;
while(sys_vmctl_get_mapping(index, &addr, &len,
&flags) == OK) {
vir_bytes vir;
if(index >= MAX_KERNMAPPINGS)
vm_panic("VM: too many kernel mappings", index);
kern_mappings[index].phys_addr = addr;
kern_mappings[index].len = len;
kern_mappings[index].flags = flags;
kern_mappings[index].lin_addr = offset;
kern_mappings[index].flags =
I386_VM_PRESENT | I386_VM_USER | I386_VM_WRITE;
if(flags & VMMF_UNCACHED)
kern_mappings[index].flags |=
I386_VM_PWT | I386_VM_PCD;
if(addr % I386_PAGE_SIZE)
vm_panic("VM: addr unaligned", addr);
if(len % I386_PAGE_SIZE)
vm_panic("VM: len unaligned", len);
vir = arch_map2vir(&vmproc[VMP_SYSTEM], offset);
printf("vir: 0x%lx\n", vir);
if(sys_vmctl_reply_mapping(index, vir) != OK)
vm_panic("VM: reply failed", NO_NUM);
offset += len;
index++;
kernmappings++;
}
}
/* Find a PDE below processes available for mapping in the
* page directories (readonly).
*/
@ -859,7 +906,7 @@ PUBLIC void pt_free(pt_t *pt)
*===========================================================================*/
PUBLIC int pt_mapkernel(pt_t *pt)
{
int r;
int r, i;
static int printed = 0;
/* Any i386 page table needs to map in the kernel address space. */
@ -889,6 +936,16 @@ PUBLIC int pt_mapkernel(pt_t *pt)
pt->pt_dir[pagedir_pde] = pagedir_pde_val;
}
for(i = 0; i < kernmappings; i++) {
if(pt_writemap(pt,
kern_mappings[i].lin_addr,
kern_mappings[i].phys_addr,
kern_mappings[i].len,
kern_mappings[i].flags, 0) != OK) {
vm_panic("pt_mapkernel: pt_writemap failed", NO_NUM);
}
}
return OK;
}