ee4016155e
these two functions will be used to support all exec() functionality going into a single library shared by RS and VFS and exec() knowledge leaving VM. . third-party mmap: allow certain processes (VFS, RS) to do mmap() on behalf of another process . PROCCTL: used to free and clear a process' address space
158 lines
2.6 KiB
C
158 lines
2.6 KiB
C
#define _SYSTEM 1
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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/* INCLUDES HERE */
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#ifdef __weak_alias
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__weak_alias(vm_remap, _vm_remap)
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__weak_alias(vm_unmap, _vm_unmap)
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__weak_alias(vm_getphys, _vm_getphys)
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__weak_alias(vm_getrefcount, _vm_getrefcount)
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__weak_alias(minix_mmap, _minix_mmap)
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__weak_alias(minix_munmap, _minix_munmap)
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__weak_alias(minix_munmap_text, _minix_munmap_text)
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#endif
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#include <sys/mman.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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void *minix_mmap_for(endpoint_t forwhom,
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void *addr, size_t len, int prot, int flags, int fd, off_t offset)
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{
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message m;
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int r;
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m.VMM_ADDR = (vir_bytes) addr;
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m.VMM_LEN = len;
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m.VMM_PROT = prot;
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m.VMM_FLAGS = flags;
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m.VMM_FD = fd;
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m.VMM_OFFSET = offset;
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m.VMM_FORWHOM = forwhom;
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if(forwhom != SELF) {
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m.VMM_FLAGS |= MAP_THIRDPARTY;
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}
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r = _syscall(VM_PROC_NR, VM_MMAP, &m);
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if(r != OK) {
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return MAP_FAILED;
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}
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return (void *) m.VMM_RETADDR;
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}
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void *minix_mmap(void *addr, size_t len, int prot, int flags,
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int fd, off_t offset)
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{
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return minix_mmap_for(SELF, addr, len, prot, flags, fd, offset);
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}
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int minix_munmap(void *addr, size_t len)
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{
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message m;
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m.VMUM_ADDR = addr;
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m.VMUM_LEN = len;
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return _syscall(VM_PROC_NR, VM_MUNMAP, &m);
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}
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int minix_munmap_text(void *addr, size_t len)
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{
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message m;
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m.VMUM_ADDR = addr;
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m.VMUM_LEN = len;
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return _syscall(VM_PROC_NR, VM_MUNMAP_TEXT, &m);
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}
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void *vm_remap(endpoint_t d,
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endpoint_t s,
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void *da,
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void *sa,
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size_t size)
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{
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message m;
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int r;
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m.VMRE_D = d;
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m.VMRE_S = s;
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m.VMRE_DA = (char *) da;
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m.VMRE_SA = (char *) sa;
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m.VMRE_SIZE = size;
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r = _syscall(VM_PROC_NR, VM_REMAP, &m);
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if (r != OK)
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return MAP_FAILED;
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return (void *) m.VMRE_RETA;
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}
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void *vm_remap_ro(endpoint_t d,
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endpoint_t s,
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void *da,
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void *sa,
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size_t size)
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{
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message m;
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int r;
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m.VMRE_D = d;
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m.VMRE_S = s;
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m.VMRE_DA = (char *) da;
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m.VMRE_SA = (char *) sa;
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m.VMRE_SIZE = size;
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r = _syscall(VM_PROC_NR, VM_REMAP_RO, &m);
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if (r != OK)
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return MAP_FAILED;
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return (void *) m.VMRE_RETA;
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}
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int vm_unmap(endpoint_t endpt, void *addr)
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{
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message m;
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m.VMUN_ENDPT = endpt;
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m.VMUN_ADDR = (long) addr;
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return _syscall(VM_PROC_NR, VM_SHM_UNMAP, &m);
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}
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unsigned long vm_getphys(int endpt, void *addr)
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{
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message m;
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int r;
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m.VMPHYS_ENDPT = endpt;
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m.VMPHYS_ADDR = (long) addr;
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r = _syscall(VM_PROC_NR, VM_GETPHYS, &m);
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if (r != OK)
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return 0;
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return m.VMPHYS_RETA;
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}
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u8_t vm_getrefcount(endpoint_t endpt, void *addr)
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{
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message m;
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int r;
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m.VMREFCNT_ENDPT = endpt;
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m.VMREFCNT_ADDR = (long) addr;
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r = _syscall(VM_PROC_NR, VM_GETREF, &m);
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if (r != OK)
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return (u8_t) -1;
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return (u8_t) m.VMREFCNT_RETC;
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}
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