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Add a little hack to the "dw/db/ds/dl" commands that allows you to dump the contents

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of a physical memory location.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19898 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2007-01-22 14:12:11 +00:00
parent 80bca3d3c8
commit 7954a14f87
1 changed files with 55 additions and 12 deletions
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67
src/system/kernel/vm/vm.cpp
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@ -1762,27 +1762,36 @@ vm_get_page_mapping(team_id aid, addr_t vaddr, addr_t *paddr)
static int
display_mem(int argc, char **argv)
{
bool physical = false;
addr_t copyAddress;
int32 displayWidth;
int32 itemSize;
int32 num = 1;
int32 num = -1;
addr_t address;
int i, j;
int i = 1, j;
if (argc < 2) {
kprintf("usage: dl/dw/ds/db <address> [num]\n"
if (argc > 1 && argv[1][0] == '-') {
if (!strcmp(argv[1], "-p") || !strcmp(argv[1], "--physical")) {
physical = true;
i++;
} else
i = 99;
}
if (argc < i + 1 || argc > i + 2) {
kprintf("usage: dl/dw/ds/db [-p|--physical] <address> [num]\n"
"\tdl - 8 bytes\n"
"\tdw - 4 bytes\n"
"\tds - 2 bytes\n"
"\tdb - 1 byte\n");
"\tdb - 1 byte\n"
" -p or --physical only allows memory from a single page to be displayed.\n");
return 0;
}
address = strtoul(argv[1], NULL, 0);
address = strtoul(argv[i], NULL, 0);
if (argc >= 3) {
num = -1;
num = atoi(argv[2]);
}
if (argc > i + 1)
num = atoi(argv[i + 1]);
// build the format string
if (strcmp(argv[0], "db") == 0) {
@ -1802,6 +1811,33 @@ display_mem(int argc, char **argv)
return 0;
}
if (num <= 0)
num = displayWidth;
if (physical) {
int32 offset = address & (B_PAGE_SIZE - 1);
if (num * itemSize + offset > B_PAGE_SIZE) {
num = (B_PAGE_SIZE - offset) / itemSize;
kprintf("NOTE: number of bytes has been cut to page size\n");
}
address = ROUNDOWN(address, B_PAGE_SIZE);
kernel_startup = true;
// vm_get_physical_page() needs to lock...
if (vm_get_physical_page(address, &copyAddress, PHYSICAL_PAGE_NO_WAIT) != B_OK) {
kprintf("getting the hardware page failed.");
kernel_startup = false;
return 0;
}
kernel_startup = false;
address += offset;
copyAddress += offset;
} else
copyAddress = address;
for (i = 0; i < num; i++) {
uint32 value;
@ -1814,7 +1850,7 @@ display_mem(int argc, char **argv)
for (j = 0; j < displayed; j++) {
char c;
if (user_memcpy(&c, (char *)address + i * itemSize + j, 1) != B_OK) {
if (user_memcpy(&c, (char *)copyAddress + i * itemSize + j, 1) != B_OK) {
displayed = j;
break;
}
@ -1831,7 +1867,7 @@ display_mem(int argc, char **argv)
kprintf(" ");
}
if (user_memcpy(&value, (uint8 *)address + i * itemSize, itemSize) != B_OK) {
if (user_memcpy(&value, (uint8 *)copyAddress + i * itemSize, itemSize) != B_OK) {
kprintf("read fault");
break;
}
@ -1853,6 +1889,13 @@ display_mem(int argc, char **argv)
}
kprintf("\n");
if (physical) {
copyAddress = ROUNDOWN(copyAddress, B_PAGE_SIZE);
kernel_startup = true;
vm_put_physical_page(copyAddress);
kernel_startup = false;
}
return 0;
}