diff options
Diffstat (limited to 'src/mainboard/emulation/qemu-q35/memmap.c')
| -rw-r--r-- | src/mainboard/emulation/qemu-q35/memmap.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/mainboard/emulation/qemu-q35/memmap.c b/src/mainboard/emulation/qemu-q35/memmap.c new file mode 100644 index 0000000000..a8b1433714 --- /dev/null +++ b/src/mainboard/emulation/qemu-q35/memmap.c @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#define __SIMPLE_DEVICE__ + +#include <console/console.h> +#include <cpu/x86/smm.h> +#include <device/pci_ops.h> +#include <mainboard/emulation/qemu-i440fx/memory.h> +#include <mainboard/emulation/qemu-i440fx/fw_cfg.h> + +#define EXT_TSEG_MBYTES 0x50 + +#define SMRAMC 0x9d +#define G_SMRAME (1 << 3) +#define D_LCK (1 << 4) +#define D_CLS (1 << 5) +#define D_OPEN (1 << 6) +#define ESMRAMC 0x9e +#define T_EN (1 << 0) +#define TSEG_SZ_MASK (3 << 1) +#define H_SMRAME (1 << 7) + +void smm_region(uintptr_t *start, size_t *size) +{ + uint8_t esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC); + + switch ((esmramc & TSEG_SZ_MASK) >> 1) { + case 0: + *size = 1 * MiB; + break; + case 1: + *size = 2 * MiB; + break; + case 2: + *size = 8 * MiB; + break; + default: + *size = pci_read_config16(PCI_DEV(0, 0, 0), EXT_TSEG_MBYTES) * MiB; + } + + *start = qemu_get_memory_size() * KiB - *size; + printk(BIOS_SPEW, "SMM_BASE: 0x%08lx, SMM_SIZE: %zu MiB\n", *start, *size / MiB); +} |