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Diffstat (limited to 'src/soc/amd/stoneyridge')
| -rw-r--r-- | src/soc/amd/stoneyridge/northbridge.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/northbridge.c b/src/soc/amd/stoneyridge/northbridge.c index 452a7bb2eb..90d227ade0 100644 --- a/src/soc/amd/stoneyridge/northbridge.c +++ b/src/soc/amd/stoneyridge/northbridge.c @@ -167,6 +167,31 @@ static void northbridge_init(struct device *dev) register_new_ioapic((u8 *)IO_APIC2_ADDR); } +/* Used by \_SB.PCI0._CRS */ +static void acpi_fill_root_complex_tom(const struct device *device) +{ + const char *scope; + + assert(device); + + scope = acpi_device_scope(device); + assert(scope); + acpigen_write_scope(scope); + + acpigen_write_name_dword("TOM1", get_top_of_mem_below_4gb()); + + /* + * Since XP only implements parts of ACPI 2.0, we can't use a qword + * here. + * See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt + * slide 22ff. + * Shift value right by 20 bit to make it fit into 32bit, + * giving us 1MB granularity and a limit of almost 4Exabyte of memory. + */ + acpigen_write_name_dword("TOM2", get_top_of_mem_above_4gb() >> 20); + acpigen_pop_len(); +} + static unsigned long acpi_fill_hest(acpi_hest_t *hest) { void *addr, *current; |