static bool __init memconsole_find(void)
{
phys_addr_t physaddr;
if (!dmi_check_system(memconsole_dmi_table))
return false;
if (coreboot_system) {
physaddr = get_address_from_acpi(CBMEM_CONSOLE_ACPI_NAME);
if (physaddr && memconsole_coreboot_init(physaddr))
return true;
physaddr = check_cbmem();
if (physaddr && memconsole_coreboot_init(physaddr))
return true;
}
return memconsole_ebda_init();
}
/*
* Search through the EBDA for the BIOS Memory Console, and
* set the global variables to point to it. Return true if found.
*/
static bool found_memconsole(void)
{
unsigned int address;
size_t length, cur;
/* Is it communicated through CBMEM? */
if (coreboot_system && check_cbmem())
return true;
address = get_bios_ebda();
if (!address) {
printk(KERN_INFO "BIOS EBDA non-existent.\n");
return false;
}
/* EBDA length is byte 0 of EBDA (in KB) */
length = *(u8 *)phys_to_virt(address);
length <<= 10; /* convert to bytes */
/*
* Search through EBDA for BIOS memory console structure
* note: signature is not necessarily dword-aligned
*/
for (cur = 0; cur < length; cur++) {
struct biosmemcon_ebda *hdr = phys_to_virt(address + cur);
/* memconsole v1 */
if (hdr->signature == BIOS_MEMCONSOLE_V1_MAGIC) {
found_v1_header(hdr);
return true;
}
/* memconsole v2 */
if (hdr->signature == BIOS_MEMCONSOLE_V2_MAGIC) {
found_v2_header(hdr);
return true;
}
}
printk(KERN_INFO "BIOS console EBDA structure not found!\n");
return false;
}
