| /* |
| * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <config.h> |
| #include <asm/post.h> |
| |
| .globl car_init |
| car_init: |
| /* |
| * Note: ebp holds the BIST value (built-in self test) so far, but ebp |
| * will be destroyed through the FSP call, thus we have to test the |
| * BIST value here before we call into FSP. |
| */ |
| test %ebp, %ebp |
| jz car_init_start |
| post_code(POST_BIST_FAILURE) |
| jmp die |
| |
| car_init_start: |
| post_code(POST_CAR_START) |
| lea find_fsp_header_romstack, %esp |
| jmp find_fsp_header |
| |
| find_fsp_header_ret: |
| /* EAX points to FSP_INFO_HEADER */ |
| mov %eax, %ebp |
| |
| /* sanity test */ |
| cmp $CONFIG_FSP_ADDR, %eax |
| jb die |
| |
| /* calculate TempRamInitEntry address */ |
| mov 0x30(%ebp), %eax |
| add 0x1c(%ebp), %eax |
| |
| /* call FSP TempRamInitEntry to setup temporary stack */ |
| lea temp_ram_init_romstack, %esp |
| jmp *%eax |
| |
| temp_ram_init_ret: |
| addl $4, %esp |
| cmp $0, %eax |
| jnz car_init_fail |
| |
| post_code(POST_CAR_CPU_CACHE) |
| |
| /* |
| * The FSP TempRamInit initializes the ecx and edx registers to |
| * point to a temporary but writable memory range (Cache-As-RAM). |
| * ecx: the start of this temporary memory range, |
| * edx: the end of this range. |
| */ |
| |
| /* stack grows down from top of CAR */ |
| movl %edx, %esp |
| subl $4, %esp |
| |
| xor %esi, %esi |
| jmp car_init_done |
| |
| .global fsp_init_done |
| fsp_init_done: |
| /* |
| * We come here from fsp_continue() with eax pointing to the HOB list. |
| * Save eax to esi temporarily. |
| */ |
| movl %eax, %esi |
| |
| car_init_done: |
| /* |
| * Re-initialize the ebp (BIST) to zero, as we already reach here |
| * which means we passed BIST testing before. |
| */ |
| xorl %ebp, %ebp |
| jmp car_init_ret |
| |
| car_init_fail: |
| post_code(POST_CAR_FAILURE) |
| |
| die: |
| hlt |
| jmp die |
| hlt |
| |
| /* |
| * The function call before CAR initialization is tricky. It cannot |
| * be called using the 'call' instruction but only the 'jmp' with |
| * the help of a handcrafted stack in the ROM. The stack needs to |
| * contain the function return address as well as the parameters. |
| */ |
| .balign 4 |
| find_fsp_header_romstack: |
| .long find_fsp_header_ret |
| |
| .balign 4 |
| temp_ram_init_romstack: |
| .long temp_ram_init_ret |
| .long temp_ram_init_params |
| temp_ram_init_params: |
| _dt_ucode_base_size: |
| /* These next two fields are filled in by ifdtool */ |
| .globl ucode_base |
| ucode_base: /* Declared in micrcode.h */ |
| .long 0 /* microcode base */ |
| .long 0 /* microcode size */ |
| .long CONFIG_SYS_MONITOR_BASE /* code region base */ |
| .long CONFIG_SYS_MONITOR_LEN /* code region size */ |