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zero: keep track of allocated pages

This commit is contained in:
Mathieu Maret 2024-03-06 22:00:09 +01:00
parent 86a0138d9c
commit dea0eba83d
1 changed files with 48 additions and 5 deletions
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53
drivers/zero.c
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@ -1,14 +1,41 @@
#include "zero.h"
#include "alloc.h"
#include "errno.h"
#include "kernel.h"
#include "klibc.h"
#include "mem.h"
#include "list.h"
#include "paging.h"
#include "types.h"
struct zeroMappedPage {
uaddr_t mappedAddr;
paddr_t phyAddr;
struct zeroMappedPage *prev, *next;
};
struct zeroMappedEntry {
int refCnt;
struct zeroMappedPage *listMapped;
};
static int insertMappedPage(struct zeroMappedEntry *entry, uaddr_t vAddr, paddr_t pAddr){
struct zeroMappedPage *info = (struct zeroMappedPage *)zalloc(sizeof(struct zeroMappedPage));
if(!info)
return -ENOMEM;
info->mappedAddr = vAddr;
info->phyAddr = pAddr;
list_add_tail(entry->listMapped, info);
return 0;
}
static int zeroOpen(struct uAddrVirtualReg *vreg)
{
struct zeroMappedEntry *ent = (struct zeroMappedEntry *)vreg->res->customData;
@ -21,6 +48,11 @@ static int zeroClose(struct uAddrVirtualReg *vreg)
struct zeroMappedEntry *ent = (struct zeroMappedEntry *)vreg->res->customData;
ent->refCnt--;
if (ent->refCnt == 0) {
struct zeroMappedPage *pageInfo;
list_collapse(ent->listMapped, pageInfo){
pageUnmap(pageInfo->mappedAddr);
free(pageInfo);
}
free(vreg->res->customData);
free(vreg->res);
}
@ -29,17 +61,26 @@ static int zeroClose(struct uAddrVirtualReg *vreg)
static int zeroNoPage(struct uAddrVirtualReg *vreg, uaddr_t addr, int right)
{
(void)vreg;
int ret = 0;
paddr_t ppage = allocPhyPage(1);
uaddr_t mappedAddr = ALIGN_DOWN(addr, PAGE_SIZE);
ret = pageMap(mappedAddr, ppage, right | PAGING_MEM_USER);
int ret = 0;
paddr_t ppage = allocPhyPage(1);
ret = pageMap(ALIGN_DOWN(addr, PAGE_SIZE), ppage, right | PAGING_MEM_USER) ;
struct zeroMappedEntry *ent = (struct zeroMappedEntry *)vreg->res->customData;
unrefPhyPage(ppage);
if (ret) {
return ret;
}
memset((void *)ALIGN_DOWN(addr, PAGE_SIZE), 0, PAGE_SIZE);
ret = insertMappedPage(ent, mappedAddr, ppage);
if (ret) {
pageUnmap(mappedAddr);
return ret;
}
memset((void *)mappedAddr, 0, PAGE_SIZE);
return ret;
}
@ -65,6 +106,8 @@ int zeroMmap(struct uAddrSpace *as, uaddr_t *uaddr, size_t size, uint32_t rights
struct zeroMappedEntry *cust =
(struct zeroMappedEntry *)zalloc(sizeof(struct zeroMappedEntry));
list_init(cust->listMapped);
res->allowedRight = PAGING_MEM_READ | PAGING_MEM_WRITE | PAGING_MEM_EXEC | PAGING_MEM_USER;
res->ops = &zeroOps;
res->customData = cust;