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tests/boot-sector: Do not overwrite the x86 buffer on other architectures 

Re-using the boot_sector code buffer from x86 for other architectures
is not very nice, especially if we add more architectures later. It's
also ugly that the test uses a huge pre-initialized array at all - the
size of the executable is very huge due to this array. So let's use a
separate buffer for each architecture instead, allocated from the heap,
so that we really just use the memory that we need.

Suggested-by: Michael Tsirkin <mst@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1502431076-22849-2-git-send-email-thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Thomas Huth 2017-08-11 07:57:55 +02:00 committed by Cornelia Huck
parent 0d4fa4996f
commit 83898cce62
1 changed files with 26 additions and 15 deletions
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41
tests/boot-sector.c
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@ -21,13 +21,12 @@
#define SIGNATURE 0xdead
#define SIGNATURE_OFFSET 0x10
#define BOOT_SECTOR_ADDRESS 0x7c00
#define SIGNATURE_ADDR (BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET)
/* Boot sector code: write SIGNATURE into memory,
/* x86 boot sector code: write SIGNATURE into memory,
* then halt.
* Q35 machine requires a minimum 0x7e000 bytes disk.
* (bug or feature?)
*/
static uint8_t boot_sector[0x7e000] = {
static uint8_t x86_boot_sector[512] = {
/* The first sector will be placed at RAM address 00007C00, and
* the BIOS transfers control to 00007C00
*/
@ -50,8 +49,8 @@ static uint8_t boot_sector[0x7e000] = {
[0x07] = HIGH(SIGNATURE),
/* 7c08: mov %ax,0x7c10 */
[0x08] = 0xa3,
[0x09] = LOW(BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET),
[0x0a] = HIGH(BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET),
[0x09] = LOW(SIGNATURE_ADDR),
[0x0a] = HIGH(SIGNATURE_ADDR),
/* 7c0b cli */
[0x0b] = 0xfa,
@ -72,7 +71,9 @@ static uint8_t boot_sector[0x7e000] = {
int boot_sector_init(char *fname)
{
int fd, ret;
size_t len = sizeof boot_sector;
size_t len;
char *boot_code;
const char *arch = qtest_get_arch();
fd = mkstemp(fname);
if (fd < 0) {
@ -80,16 +81,26 @@ int boot_sector_init(char *fname)
return 1;
}
/* For Open Firmware based system, we can use a Forth script instead */
if (strcmp(qtest_get_arch(), "ppc64") == 0) {
len = sprintf((char *)boot_sector, "\\ Bootscript\n%x %x c! %x %x c!\n",
LOW(SIGNATURE), BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET,
HIGH(SIGNATURE), BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET + 1);
if (g_str_equal(arch, "i386") || g_str_equal(arch, "x86_64")) {
/* Q35 requires a minimum 0x7e000 bytes disk (bug or feature?) */
len = MAX(0x7e000, sizeof(x86_boot_sector));
boot_code = g_malloc0(len);
memcpy(boot_code, x86_boot_sector, sizeof(x86_boot_sector));
} else if (g_str_equal(arch, "ppc64")) {
/* For Open Firmware based system, use a Forth script */
boot_code = g_strdup_printf("\\ Bootscript\n%x %x c! %x %x c!\n",
LOW(SIGNATURE), SIGNATURE_ADDR,
HIGH(SIGNATURE), SIGNATURE_ADDR + 1);
len = strlen(boot_code);
} else {
g_assert_not_reached();
}
ret = write(fd, boot_sector, len);
ret = write(fd, boot_code, len);
close(fd);
g_free(boot_code);
if (ret != len) {
fprintf(stderr, "Could not write \"%s\"", fname);
return 1;
@ -115,8 +126,8 @@ void boot_sector_test(void)
* instruction.
*/
for (i = 0; i < TEST_CYCLES; ++i) {
signature_low = readb(BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET);
signature_high = readb(BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET + 1);
signature_low = readb(SIGNATURE_ADDR);
signature_high = readb(SIGNATURE_ADDR + 1);
signature = (signature_high << 8) | signature_low;
if (signature == SIGNATURE) {
break;