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Allow to unref unrefered page

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This commit is contained in:
Mathieu Maret 2021-10-26 22:08:36 +02:00
parent 4aa093034b
commit 2c6ffe34a1
2 changed files with 7 additions and 3 deletions
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8
core/mem.c
View File

@ -1,8 +1,9 @@
#include "mem.h"
#include "assert.h" #include "assert.h"
#include "errno.h"
#include "kernel.h" #include "kernel.h"
#include "klibc.h" #include "klibc.h"
#include "list.h" #include "list.h"
#include "mem.h"
#include "types.h" #include "types.h"
static struct phyMemDesc *pageDesc = (struct phyMemDesc *)&__ld_kernel_end; static struct phyMemDesc *pageDesc = (struct phyMemDesc *)&__ld_kernel_end;
@ -139,9 +140,10 @@ int unrefPhyPage(paddr_t addr)
{ {
struct phyMemDesc *mem = addr2memDesc(addr); struct phyMemDesc *mem = addr2memDesc(addr);
if (!mem) { if (!mem) {
return -1; return -EINVAL;
} }
assert(mem->ref > 0); if(mem->ref <= 0)
return -EINVAL;
mem->ref--; mem->ref--;
if (mem->ref == 0) { if (mem->ref == 0) {
allocatedPage--; allocatedPage--;

2
core/mem.h
View File

@ -7,6 +7,8 @@
#define PAGE_SHIFT 12U #define PAGE_SHIFT 12U
#define PAGE_SIZE (1U << PAGE_SHIFT) #define PAGE_SIZE (1U << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
// Defined in linker.ld script // Defined in linker.ld script
extern uint32_t __ld_kernel_begin; extern uint32_t __ld_kernel_begin;