static void
nouveau_bios_shadow_acpi(struct nouveau_bios *bios)
{
struct pci_dev *pdev = nv_device(bios)->pdev;
int ret, cnt, i;
if (!nouveau_acpi_rom_supported(pdev)) {
bios->data = NULL;
return;
}
bios->size = 0;
bios->data = kmalloc(4096, GFP_KERNEL);
if (bios->data) {
if (nouveau_acpi_get_bios_chunk(bios->data, 0, 4096) == 4096)
bios->size = bios->data[2] * 512;
kfree(bios->data);
}
if (!bios->size)
return;
bios->data = kmalloc(bios->size, GFP_KERNEL);
if (bios->data) {
/* disobey the acpi spec - much faster on at least w530 ... */
ret = nouveau_acpi_get_bios_chunk(bios->data, 0, bios->size);
if (ret != bios->size ||
nvbios_checksum(bios->data, bios->size)) {
/* ... that didn't work, ok, i'll be good now */
for (i = 0; i < bios->size; i += cnt) {
cnt = min((bios->size - i), (u32)4096);
ret = nouveau_acpi_get_bios_chunk(bios->data, i, cnt);
if (ret != cnt)
break;
}
}
}
}
/* This version of the shadow function disobeys the ACPI spec and tries
* to fetch in units of more than 4KiB at a time. This is a LOT faster
* on some systems, such as Lenovo W530.
*/
static u32
acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
{
u32 limit = (offset + length + 0xfff) & ~0xfff;
u32 start = offset & ~0x00000fff;
u32 fetch = limit - start;
if (nvbios_extend(bios, limit) > 0) {
int ret = nouveau_acpi_get_bios_chunk(bios->data, start, fetch);
if (ret == fetch)
return fetch;
}
return 0;
}
/* Other systems, such as the one in fdo#55948, will report a success
* but only return 4KiB of data. The common bios fetching logic will
* detect an invalid image, and fall back to this version of the read
* function.
*/
static u32
acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
{
u32 limit = (offset + length + 0xfff) & ~0xfff;
u32 start = offset & ~0xfff;
u32 fetch = 0;
if (nvbios_extend(bios, limit) > 0) {
while (start + fetch < limit) {
int ret = nouveau_acpi_get_bios_chunk(bios->data,
start + fetch,
0x1000);
if (ret != 0x1000)
break;
fetch += 0x1000;
}
}
return fetch;
}
