minix/lib/syslib/sys_vmctl.c
Cristiano Giuffrida c5b309ff07 Merge of Wu's GSOC 09 branch (src.20090525.r4372.wu)
Main changes:
- COW optimization for safecopy.
- safemap, a grant-based interface for sharing memory regions between processes.
- Integration with safemap and complete rework of DS, supporting new data types
  natively (labels, memory ranges, memory mapped ranges).
- For further information:
  http://wiki.minix3.org/en/SummerOfCode2009/MemoryGrants

Additional changes not included in the original Wu's branch:
- Fixed unhandled case in VM when using COW optimization for safecopy in case
  of a block that has already been shared as SMAP.
- Better interface and naming scheme for sys_saferevmap and ds_retrieve_map
  calls.
- Better input checking in syslib: check for page alignment when creating
  memory mapping grants.
- DS notifies subscribers when an entry is deleted.
- Documented the behavior of indirect grants in case of memory mapping.
- Test suite in /usr/src/test/safeperf|safecopy|safemap|ds/* reworked
  and extended.
- Minor fixes and general cleanup.
- TO-DO: Grant ids should be generated and managed the way endpoints are to make
sure grant slots are never misreused.
2010-01-14 15:24:16 +00:00

109 lines
2.2 KiB
C

#include "syslib.h"
PUBLIC int sys_vmctl(endpoint_t who, int param, u32_t value)
{
message m;
int r;
m.SVMCTL_WHO = who;
m.SVMCTL_PARAM = param;
m.SVMCTL_VALUE = value;
r = _taskcall(SYSTASK, SYS_VMCTL, &m);
return(r);
}
PUBLIC int sys_vmctl_get_pagefault_i386(endpoint_t *who, u32_t *cr2, u32_t *err)
{
message m;
int r;
m.SVMCTL_WHO = SELF;
m.SVMCTL_PARAM = VMCTL_GET_PAGEFAULT;
r = _taskcall(SYSTASK, SYS_VMCTL, &m);
if(r == OK) {
*who = m.SVMCTL_PF_WHO;
*cr2 = m.SVMCTL_PF_I386_CR2;
*err = m.SVMCTL_PF_I386_ERR;
}
return(r);
}
PUBLIC int sys_vmctl_get_cr3_i386(endpoint_t who, u32_t *cr3)
{
message m;
int r;
m.SVMCTL_WHO = who;
m.SVMCTL_PARAM = VMCTL_I386_GETCR3;
r = _taskcall(SYSTASK, SYS_VMCTL, &m);
if(r == OK) {
*cr3 = m.SVMCTL_VALUE;
}
return(r);
}
PUBLIC int sys_vmctl_get_memreq(endpoint_t *who, vir_bytes *mem,
vir_bytes *len, int *wrflag, endpoint_t *who_s, vir_bytes *mem_s,
endpoint_t *requestor)
{
message m;
int r;
m.SVMCTL_WHO = SELF;
m.SVMCTL_PARAM = VMCTL_MEMREQ_GET;
r = _taskcall(SYSTASK, SYS_VMCTL, &m);
if(r >= 0) {
*who = m.SVMCTL_MRG_TARGET;
*mem = m.SVMCTL_MRG_ADDR;
*len = m.SVMCTL_MRG_LENGTH;
*wrflag = m.SVMCTL_MRG_FLAG;
*who_s = m.SVMCTL_MRG_EP2;
*mem_s = m.SVMCTL_MRG_ADDR2;
*requestor = (endpoint_t) m.SVMCTL_MRG_REQUESTOR;
}
return r;
}
PUBLIC int sys_vmctl_enable_paging(struct mem_map *map)
{
message m;
m.SVMCTL_WHO = SELF;
m.SVMCTL_PARAM = VMCTL_ENABLE_PAGING;
m.SVMCTL_VALUE = (int) map;
return _taskcall(SYSTASK, SYS_VMCTL, &m);
}
PUBLIC int sys_vmctl_get_mapping(int index,
phys_bytes *addr, phys_bytes *len, int *flags)
{
int r;
message m;
m.SVMCTL_WHO = SELF;
m.SVMCTL_PARAM = VMCTL_KERN_PHYSMAP;
m.SVMCTL_VALUE = (int) index;
r = _taskcall(SYSTASK, SYS_VMCTL, &m);
if(r != OK)
return r;
*addr = m.SVMCTL_MAP_PHYS_ADDR;
*len = m.SVMCTL_MAP_PHYS_LEN;
*flags = m.SVMCTL_MAP_FLAGS;
return OK;
}
PUBLIC int sys_vmctl_reply_mapping(int index, vir_bytes addr)
{
int r;
message m;
m.SVMCTL_WHO = SELF;
m.SVMCTL_PARAM = VMCTL_KERN_MAP_REPLY;
m.SVMCTL_VALUE = index;
m.SVMCTL_MAP_VIR_ADDR = (char *) addr;
return _taskcall(SYSTASK, SYS_VMCTL, &m);
}