mirrors/Astral
1
0
Fork 0
mirror of https://github.com/Mathewnd/Astral.git synced 2026-10-27 12:48:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

tmpfs: mmap and munmap

Browse Source
This commit is contained in:
Matheus
2023-05-06 17:51:10 -03:00
parent a1919e1d36
commit 87313086a4
2 changed files with 58 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel-src/fs/tmpfs.c
+45 -2
View File
@@ -8,6 +8,10 @@
#include <util.h>
#include <kernel/abi.h>
#include <kernel/devfs.h>
#include <kernel/pmm.h>
#include <kernel/vmm.h>
#include <arch/cpu.h>
#include <string.h>
static scache_t *nodecache;
static tmpfsnode_t *newnode(vfs_t *vfs, int type);
@@ -234,7 +238,7 @@ static int tmpfs_read(vnode_t *node, void *buffer, size_t size, uintmax_t offset
return 0;
}
// rtop of read goes past end of file
// top of read goes past end of file
if (offset + size > tmpnode->attr.size)
size = tmpnode->attr.size - offset;
@@ -354,6 +358,43 @@ static int tmpfs_readlink(vnode_t *node, char **link, cred_t *cred) {
return 0;
}
static int tmpfs_mmap(vnode_t *node, void *addr, uintmax_t offset, int flags, cred_t *cred) {
void *paddr = pmm_alloc(1, PMM_SECTION_DEFAULT);
if (paddr == NULL)
return ENOMEM;
if (arch_mmu_map(_cpu()->vmmctx->pagetable, paddr, addr, vnodeflagstommuflags(flags)) == false) {
pmm_free(paddr, 1);
return ENOMEM;
}
size_t readc;
int e = tmpfs_read(node, addr, PAGE_SIZE, offset, flags, &readc, cred);
if (e) {
arch_mmu_unmap(_cpu()->vmmctx->pagetable, addr);
pmm_free(paddr, 1);
return e;
}
memset((void *)((uintptr_t)addr + readc), 0, PAGE_SIZE - readc);
return 0;
}
static int tmpfs_munmap(vnode_t *node, void *addr, uintmax_t offset, int flags, cred_t *cred) {
if ((flags & V_FFLAGS_SHARED) == 0) {
size_t wc;
// TODO no growing flag
__assert(tmpfs_write(node, addr, PAGE_SIZE, offset, flags, &wc, cred) == 0);
}
void *paddr = arch_mmu_getphysical(_cpu()->vmmctx->pagetable, addr);
__assert(paddr);
arch_mmu_unmap(_cpu()->vmmctx->pagetable, addr);
pmm_free(paddr, 1);
return 0;
}
static int tmpfs_inactive(vnode_t *node) {
freenode((tmpfsnode_t *)node);
return 0;
@@ -379,7 +420,9 @@ static vops_t vnops = {
.link = tmpfs_link,
.symlink = tmpfs_symlink,
.readlink = tmpfs_readlink,
.inactive = tmpfs_inactive
.inactive = tmpfs_inactive,
.mmap = tmpfs_mmap,
.munmap = tmpfs_munmap
};
static tmpfsnode_t *newnode(vfs_t *vfs, int type) {
kernel-src/include/kernel/vmm.h
+13
View File
@@ -3,6 +3,7 @@
#include <arch/mmu.h>
#include <spinlock.h>
#include <kernel/vfs.h>
#define VMM_FLAGS_PAGESIZE 1
#define VMM_FLAGS_ALLOCATE 2
@@ -57,6 +58,18 @@ typedef struct {
extern vmmcontext_t vmm_kernelctx;
static inline mmuflags_t vnodeflagstommuflags(int flags) {
mmuflags_t mmuflags = 0;
if (flags & V_FFLAGS_READ)
mmuflags |= ARCH_MMU_FLAGS_READ;
if (flags & V_FFLAGS_WRITE)
mmuflags |= ARCH_MMU_FLAGS_WRITE;
if ((flags & V_FFLAGS_EXEC) == 0)
mmuflags |= ARCH_MMU_FLAGS_NOEXEC;
return mmuflags;
}
void *vmm_map(void *addr, size_t size, int flags, mmuflags_t mmuflags, void *private);
void vmm_unmap(void *addr, size_t size, int flags);
bool vmm_pagefault(void *addr, bool user, int actions);