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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* phymem-mon.c: physical memory access code
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "plex86.h"
#define IN_MONITOR_SPACE
#include "monitor.h"
void
read_physical(vm_t *vm, Bit32u paddr, unsigned length, void *data_v)
{
phy_page_usage_t *page_usage;
Bit32u ppage_index, ppage_offset;
Bit8u *page_laddr, *data;
unsigned i, l0, multiple_pages;
/* paddr is the physical address _after_ A20 Enable applied */
/* +++ should deal with writes to ROM */
/* +++ should deal with writes to UC mem areas like VGA framebuffer */
data = data_v;
ppage_index = paddr >> 12;
ppage_offset = paddr & 0xfff;
next_page:
if (ppage_index >= vm->pages.guest_n_pages) {
/* monpanic(vm, "read_physical OOB: 0x%x\n", paddr); */
/* Read outside of physical memory; can be used for physical
* memory sizing.
*/
for (i=0; i<length; i++)
((unsigned char *) data_v)[i] = 0xff;
return;
}
page_usage = getPageUsage(vm, ppage_index);
l0 = length;
multiple_pages = 0;
if ( (ppage_offset + length) > 4096 ) {
l0 = 4096 - ppage_offset;
multiple_pages = 1;
}
if (page_usage->attr.fields.access_perm == PagePermEmulate) {
Bit32u raw;
raw = page_usage->attr.raw;
if (raw & PageUsagePTbl) {
/* We must update the A&D bits of the page table according with
* the A&D bits in the actual monitor page tables first. Then
* we can let the read occur as usual.
*/
updateGuestPTbl(vm, ppage_index);
raw &= ~PageUsagePTbl;
}
if (raw & PageUsagePDir) {
updateGuestPDir(vm, ppage_index);
raw &= ~PageUsagePDir;
}
if (raw & PageUsageVCode) {
monpanic(vm, "read_phy: PageUsageVCode\n");
raw &= ~PageUsageVCode;
}
if (raw & PageUsageMemMapIO) {
/* This physical address corresponds to a memory mapped IO
* device (for example VGA). Redirect the access to the
* device emulation
*/
/* Bit32u dword_boundary_start, dword_boundary_end; */
Bit32u temp_data;
Bit8u *src;
/* dword_boundary_start = ppage_offset >> 2; */
/* dword_boundary_end = (ppage_offset + l0 - 1) >> 2; */
/* if (dword_boundary_start != dword_boundary_end) { */
/* monpanic(vm, "read_phy: MemMapIO crosses dword boundary.\n"); */
/* } */
if (l0 > 4)
monpanic(vm, "read_phy: MemMapIO access > 4.\n");
temp_data = sysMemMapIORead(vm, (ppage_index<<12) | ppage_offset, l0);
src = (Bit8u *) &temp_data;
for (i=0; i<l0; i++) {
*data++ = *src++;
}
raw &= ~PageUsageMemMapIO;
goto incr_next_page;
}
}
page_laddr = open_guest_phy_page(vm, ppage_index,
vm->guest.addr.tmp_phy_page0);
for (i=0; i<l0; i++)
*data++ = page_laddr[ppage_offset++];
incr_next_page:
if (!multiple_pages)
return;
length -= l0;
ppage_index = A20PageIndex(vm, ppage_index + 1);
ppage_offset = 0;
goto next_page;
}
void
write_physical(vm_t *vm, Bit32u paddr, unsigned length, void *data_v)
{
phy_page_usage_t *page_usage;
Bit32u ppage_index, ppage_offset;
Bit8u *page_laddr, *data;
unsigned i, l0, multiple_pages;
/* +++ see notes for read_physical */
data = data_v;
ppage_index = paddr >> 12;
ppage_offset = paddr & 0xfff;
next_page:
if (ppage_index >= vm->pages.guest_n_pages) {
/* monpanic(vm, "write_physical: OOB\n"); */
/* Write outside of physical memory; can be used for physical
* memory sizing.
*/
return;
}
page_usage = getPageUsage(vm, ppage_index);
l0 = length;
multiple_pages = 0;
if ( (ppage_offset + length) > 4096 ) {
l0 = 4096 - ppage_offset;
multiple_pages = 1;
}
if (page_usage->attr.fields.access_perm != PagePermRW) {
Bit32u raw;
raw = page_usage->attr.raw;
if (raw & PageUsagePTbl) {
/* We must update the A&D bits of the page table according with
* the A&D bits in the actual monitor page tables first. Then
* we can let the write occur. Also schedule a monitor page
* table rebuild, because of the change.
*/
updateGuestPTbl(vm, ppage_index);
vm->modeChange |= ModeChangeEventPaging | ModeChangeRequestPaging;
raw &= ~PageUsagePTbl;
}
if (raw & PageUsagePDir) {
updateGuestPDir(vm, ppage_index);
vm->modeChange |= ModeChangeEventPaging | ModeChangeRequestPaging;
raw &= ~PageUsagePDir;
}
if (raw & PageUsageVCode) {
removePageAttributes(vm, paddr>>12, PageUsageVCode);
raw &= ~PageUsageVCode;
}
if (raw & PageUsageMemMapIO) {
/* This physical address corresponds to a memory mapped IO
* device (for example VGA). Redirect the access to the
* device emulation
*/
/* Bit32u dword_boundary_start, dword_boundary_end; */
Bit32u temp_data;
Bit8u *dst;
/* dword_boundary_start = ppage_offset >> 2; */
/* dword_boundary_end = (ppage_offset + l0 - 1) >> 2; */
/* if (dword_boundary_start != dword_boundary_end) { */
/* monpanic(vm, "write_phy: MemMapIO crosses dword boundary.\n"); */
/* } */
if (l0 > 4)
monpanic(vm, "write_phy: MemMapIO access > 4.\n");
temp_data = 0; /* zero out initial value */
dst = (Bit8u *) &temp_data;
for (i=0; i<l0; i++) {
*dst++ = *data++;
}
sysMemMapIOWrite(vm, (ppage_index<<12) | ppage_offset, l0, temp_data);
raw &= ~PageUsageMemMapIO;
goto incr_next_page;
}
/*monprint(vm, "raw=0x%x\n", page_usage->attr.raw); */
/*monpanic(vm, "write_physical: PagePerm != RW\n"); */
}
page_laddr = open_guest_phy_page(vm, ppage_index,
vm->guest.addr.tmp_phy_page0);
for (i=0; i<l0; i++)
page_laddr[ppage_offset++] = *data++;
incr_next_page:
if (!multiple_pages)
return;
length -= l0;
ppage_index = A20PageIndex(vm, ppage_index + 1);
ppage_offset = 0;
goto next_page;
}
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