d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Reduce diffs between VM86 and X86EMU wrappers for x86bios_alloc() and

Browse Source 
x86bios_free().  Add strict sanity checks for VM86 wrapper and add strict
page table locking for X86EMU wrapper.
This commit is contained in:
Jung-uk Kim 2010-08-09 17:54:26 +00:00
parent bc65068d4a
commit b41f3f4cde
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=211112
1 changed files with 29 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
sys/compat/x86bios/x86bios.c
View File

@ -112,44 +112,49 @@ x86bios_vmf2emu(struct vm86frame *vmf, struct x86emu_regs *regs)
void *
x86bios_alloc(uint32_t *offset, size_t size, int flags)
{
vm_offset_t addr;
void *vaddr;
int i;
addr = (vm_offset_t)contigmalloc(size, M_DEVBUF, flags, 0,
X86BIOS_MEM_SIZE, PAGE_SIZE, 0);
if (addr != 0) {
*offset = vtophys(addr);
if (offset == NULL || size == 0)
return (NULL);
vaddr = contigmalloc(size, M_DEVBUF, flags, 0, X86BIOS_MEM_SIZE,
PAGE_SIZE, 0);
if (vaddr != NULL) {
*offset = vtophys(vaddr);
mtx_lock(&x86bios_lock);
for (i = 0; i < atop(round_page(size)); i++)
vm86_addpage(&x86bios_vmc, atop(*offset) + i,
addr + ptoa(i));
(vm_offset_t)vaddr + ptoa(i));
mtx_unlock(&x86bios_lock);
}
return ((void *)addr);
return (vaddr);
}
void
x86bios_free(void *addr, size_t size)
{
int i, last;
vm_paddr_t paddr;
int i, nfree;
if (addr == NULL || size == 0)
return;
paddr = vtophys(addr);
if (paddr >= X86BIOS_MEM_SIZE || (paddr & PAGE_MASK) != 0)
return;
nfree = atop(round_page(size));
mtx_lock(&x86bios_lock);
for (i = 0, last = -1; i < x86bios_vmc.npages; i++)
if (x86bios_vmc.pmap[i].kva >= (vm_offset_t)addr &&
x86bios_vmc.pmap[i].kva < (vm_offset_t)addr + size) {
bzero(&x86bios_vmc.pmap[i],
sizeof(x86bios_vmc.pmap[i]));
last = i;
}
if (last < 0) {
for (i = 0; i < x86bios_vmc.npages; i++)
if (x86bios_vmc.pmap[i].kva == (vm_offset_t)addr)
break;
if (i >= x86bios_vmc.npages) {
mtx_unlock(&x86bios_lock);
return;
}
if (last == x86bios_vmc.npages - 1) {
x86bios_vmc.npages -= atop(round_page(size));
for (i = x86bios_vmc.npages - 1;
i >= 0 && x86bios_vmc.pmap[i].kva == 0; i--)
bzero(x86bios_vmc.pmap + i, sizeof(*x86bios_vmc.pmap) * nfree);
if (i + nfree == x86bios_vmc.npages) {
x86bios_vmc.npages -= nfree;
while (--i >= 0 && x86bios_vmc.pmap[i].kva == 0)
x86bios_vmc.npages--;
}
mtx_unlock(&x86bios_lock);
@ -552,12 +557,13 @@ x86bios_alloc(uint32_t *offset, size_t size, int flags)
if (offset == NULL || size == 0)
return (NULL);
vaddr = contigmalloc(size, M_DEVBUF, flags, X86BIOS_RAM_BASE,
x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0);
if (vaddr != NULL) {
*offset = vtophys(vaddr);
mtx_lock_spin(&x86bios_lock);
x86bios_set_pages((vm_offset_t)vaddr, *offset, size);
mtx_unlock_spin(&x86bios_lock);
}
return (vaddr);
@ -570,14 +576,14 @@ x86bios_free(void *addr, size_t size)
if (addr == NULL || size == 0)
return;
paddr = vtophys(addr);
if (paddr < X86BIOS_RAM_BASE || paddr >= x86bios_rom_phys ||
paddr % X86BIOS_PAGE_SIZE != 0)
return;
mtx_lock_spin(&x86bios_lock);
bzero(x86bios_map + paddr / X86BIOS_PAGE_SIZE,
sizeof(*x86bios_map) * howmany(size, X86BIOS_PAGE_SIZE));
mtx_unlock_spin(&x86bios_lock);
contigfree(addr, size, M_DEVBUF);
}