/*
* 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;
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;
}
void __init reserve_ebda_region(void)
{
unsigned int lowmem, ebda_addr;
/* */
/* */
/* */
/* */
/* */
/* */
if (paravirt_enabled())
return;
/* */
lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
lowmem <<= 10;
/* */
ebda_addr = get_bios_ebda();
/* */
/* */
if ((lowmem - ebda_addr) <= 0x10000)
lowmem = ebda_addr;
/* */
/* */
if ((ebda_addr == 0) && (lowmem >= 0x9f000))
lowmem = 0x9f000;
/* */
if ((lowmem == 0) || (lowmem >= 0x100000))
lowmem = 0x9f000;
/* */
memblock_reserve(lowmem, 0x100000 - lowmem);
}
void __init reserve_ebda_region(void)
{
unsigned int lowmem, ebda_addr;
/* To determine the position of the EBDA and the */
/* end of conventional memory, we need to look at */
/* the BIOS data area. In a paravirtual environment */
/* that area is absent. We'll just have to assume */
/* that the paravirt case can handle memory setup */
/* correctly, without our help. */
if (paravirt_enabled())
return;
/* end of low (conventional) memory */
lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
lowmem <<= 10;
/* start of EBDA area */
ebda_addr = get_bios_ebda();
/* Fixup: bios puts an EBDA in the top 64K segment */
/* of conventional memory, but does not adjust lowmem. */
if ((lowmem - ebda_addr) <= 0x10000)
lowmem = ebda_addr;
/* Fixup: bios does not report an EBDA at all. */
/* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
if ((ebda_addr == 0) && (lowmem >= 0x9f000))
lowmem = 0x9f000;
/* Paranoia: should never happen, but... */
if ((lowmem == 0) || (lowmem >= 0x100000))
lowmem = 0x9f000;
/* reserve all memory between lowmem and the 1MB mark */
reserve_early_overlap_ok(lowmem, 0x100000, "BIOS reserved");
}
static int __init ibm_rtl_init(void) {
unsigned long ebda_addr, ebda_size;
unsigned int ebda_kb;
int ret = -ENODEV, i;
if (force)
pr_warn("module loaded by force\n");
/* first ensure that we are running on IBM HW */
else if (efi_enabled || !dmi_check_system(ibm_rtl_dmi_table))
return -ENODEV;
/* Get the address for the Extended BIOS Data Area */
ebda_addr = get_bios_ebda();
if (!ebda_addr) {
RTL_DEBUG("no BIOS EBDA found\n");
return -ENODEV;
}
ebda_map = ioremap(ebda_addr, 4);
if (!ebda_map)
return -ENOMEM;
/* First word in the EDBA is the Size in KB */
ebda_kb = ioread16(ebda_map);
RTL_DEBUG("EBDA is %d kB\n", ebda_kb);
if (ebda_kb == 0)
goto out;
iounmap(ebda_map);
ebda_size = ebda_kb*1024;
/* Remap the whole table */
ebda_map = ioremap(ebda_addr, ebda_size);
if (!ebda_map)
return -ENOMEM;
/* search for the _RTL_ signature at the start of the table */
for (i = 0 ; i < ebda_size/sizeof(unsigned int); i++) {
struct ibm_rtl_table __iomem * tmp;
tmp = (struct ibm_rtl_table __iomem *) (ebda_map+i);
if ((readq(&tmp->signature) & RTL_MASK) == RTL_SIGNATURE) {
phys_addr_t addr;
unsigned int plen;
RTL_DEBUG("found RTL_SIGNATURE at %p\n", tmp);
rtl_table = tmp;
/* The address, value, width and offset are platform
* dependent and found in the ibm_rtl_table */
rtl_cmd_width = ioread8(&rtl_table->cmd_granularity);
rtl_cmd_type = ioread8(&rtl_table->cmd_address_type);
RTL_DEBUG("rtl_cmd_width = %u, rtl_cmd_type = %u\n",
rtl_cmd_width, rtl_cmd_type);
addr = ioread32(&rtl_table->cmd_port_address);
RTL_DEBUG("addr = %#llx\n", (unsigned long long)addr);
plen = rtl_cmd_width/sizeof(char);
rtl_cmd_addr = rtl_port_map(addr, plen);
RTL_DEBUG("rtl_cmd_addr = %p\n", rtl_cmd_addr);
if (!rtl_cmd_addr) {
ret = -ENOMEM;
break;
}
ret = rtl_setup_sysfs();
break;
}
}
out:
if (ret) {
iounmap(ebda_map);
rtl_port_unmap(rtl_cmd_addr);
}
return ret;
}
static int __init ibm_rtl_init(void) {
unsigned long ebda_addr, ebda_size;
unsigned int ebda_kb;
int ret = -ENODEV, i;
if (force)
pr_warn("module loaded by force\n");
else if (efi_enabled || !dmi_check_system(ibm_rtl_dmi_table))
return -ENODEV;
ebda_addr = get_bios_ebda();
if (!ebda_addr) {
RTL_DEBUG("no BIOS EBDA found\n");
return -ENODEV;
}
ebda_map = ioremap(ebda_addr, 4);
if (!ebda_map)
return -ENOMEM;
ebda_kb = ioread16(ebda_map);
RTL_DEBUG("EBDA is %d kB\n", ebda_kb);
if (ebda_kb == 0)
goto out;
iounmap(ebda_map);
ebda_size = ebda_kb*1024;
ebda_map = ioremap(ebda_addr, ebda_size);
if (!ebda_map)
return -ENOMEM;
for (i = 0 ; i < ebda_size/sizeof(unsigned int); i++) {
struct ibm_rtl_table __iomem * tmp;
tmp = (struct ibm_rtl_table __iomem *) (ebda_map+i);
if ((readq(&tmp->signature) & RTL_MASK) == RTL_SIGNATURE) {
phys_addr_t addr;
unsigned int plen;
RTL_DEBUG("found RTL_SIGNATURE at %p\n", tmp);
rtl_table = tmp;
rtl_cmd_width = ioread8(&rtl_table->cmd_granularity);
rtl_cmd_type = ioread8(&rtl_table->cmd_address_type);
RTL_DEBUG("rtl_cmd_width = %u, rtl_cmd_type = %u\n",
rtl_cmd_width, rtl_cmd_type);
addr = ioread32(&rtl_table->cmd_port_address);
RTL_DEBUG("addr = %#llx\n", (unsigned long long)addr);
plen = rtl_cmd_width/sizeof(char);
rtl_cmd_addr = rtl_port_map(addr, plen);
RTL_DEBUG("rtl_cmd_addr = %p\n", rtl_cmd_addr);
if (!rtl_cmd_addr) {
ret = -ENOMEM;
break;
}
ret = rtl_setup_sysfs();
break;
}
}
out:
if (ret) {
iounmap(ebda_map);
rtl_port_unmap(rtl_cmd_addr);
}
return ret;
}