| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <cbmem.h> |
| #include <cpu/x86/smm.h> |
| #include <soc/iosf.h> |
| |
| static size_t smm_region_size(void) |
| { |
| u32 smm_size; |
| smm_size = iosf_bunit_read(BUNIT_SMRRH) & 0xFFFF; |
| smm_size -= iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF; |
| smm_size = (smm_size + 1) << 20; |
| return smm_size; |
| } |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| *start = (iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20; |
| *size = smm_region_size(); |
| } |
| |
| void *cbmem_top_chipset(void) |
| { |
| uintptr_t smm_base; |
| size_t smm_size; |
| |
| /* |
| * +-------------------------+ Top of RAM (aligned) |
| * | System Management Mode | |
| * | code and data | Length: CONFIG_SMM_TSEG_SIZE |
| * | (TSEG) | |
| * +-------------------------+ SMM base (aligned) |
| * | | |
| * | Chipset Reserved Memory | Length: Multiple of CONFIG_SMM_TSEG_SIZE |
| * | | |
| * +-------------------------+ top_of_ram (aligned) |
| * | | |
| * | CBMEM Root | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | FSP Reserved Memory | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | Various CBMEM Entries | |
| * | | |
| * +-------------------------+ top_of_stack (8 byte aligned) |
| * | | |
| * | stack (CBMEM Entry) | |
| * | | |
| * +-------------------------+ |
| */ |
| |
| smm_region(&smm_base, &smm_size); |
| return (void *)smm_base; |
| } |
