mirror of
https://github.com/Mathewnd/Astral.git
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Matheus
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
#include <kernel/syscalls.h>
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#include <kernel/vmm.h>
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#include <sys/types.h>
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#include <errno.h>
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// linux abi
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#define PROT_NONE 0x00
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#define PROT_READ 0x01
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#define PROT_WRITE 0x02
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#define PROT_EXEC 0x04
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#define MAP_FILE 0x00
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#define MAP_SHARED 0x01
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#define MAP_PRIVATE 0x02
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#define MAP_FIXED 0x10
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#define MAP_ANON 0x20
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#define MAP_ANONYMOUS 0x20
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#define MAP_NORESERVE 0x4000
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#define MS_ASYNC 0x01
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#define MS_INVALIDATE 0x02
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#define MS_SYNC 0x04
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#define MCL_CURRENT 0x01
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#define MCL_FUTURE 0x02
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#define POSIX_MADV_NORMAL 0
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#define POSIX_MADV_RANDOM 1
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#define POSIX_MADV_SEQUENTIAL 2
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#define POSIX_MADV_WILLNEED 3
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#define POSIX_MADV_DONTNEED 4
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#define MADV_NORMAL 0
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#define MADV_RANDOM 1
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#define MADV_SEQUENTIAL 2
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#define MADV_WILLNEED 3
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#define MADV_DONTNEED 4
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#define MADV_FREE 8
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#define MREMAP_MAYMOVE 1
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#define MREMAP_FIXED 2
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#define MFD_CLOEXEC 1U
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#define MFD_ALLOW_SEALING 2U
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syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off_t offset){
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syscallret retv;
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retv.ret = -1;
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retv.errno = 0;
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if(len == 0 || hint > USER_SPACE_END){
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retv.errno = EINVAL;
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return retv;
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}
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if((flags & (MAP_ANON | MAP_PRIVATE)) != (MAP_ANON | MAP_PRIVATE)){
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retv.errno = ENOSYS;
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return retv;
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}
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size_t mmuflags = 0;
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if(prot & PROT_READ)
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mmuflags |= ARCH_MMU_MAP_READ;
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if(prot & PROT_WRITE)
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mmuflags |= ARCH_MMU_MAP_WRITE;
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if(!prot & PROT_EXEC)
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mmuflags |= ARCH_MMU_MAP_NOEXEC;
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mmuflags |= ARCH_MMU_MAP_USER;
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size_t plen = len / PAGE_SIZE + (len % PAGE_SIZE ? 1 : 0);
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void* ret = NULL;
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if(hint)
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ret = vmm_allocnowat(hint, mmuflags, len) ? hint : NULL; // TODO demand page
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if(ret == NULL && (flags & MAP_FIXED) == 0)
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ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen);
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if(!ret)
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retv.errno = ENOMEM;
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else{
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retv.ret = ret;
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if(hint && (flags & MAP_ANON))
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memset(ret, 0, plen*PAGE_SIZE);
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}
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return retv;
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}
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