| Simon Glass | a9a4426 | 2015-04-29 22:25:59 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 Gooogle, Inc |
| 3 | * Written by Simon Glass <sjg@chromium.org> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #ifndef _ASM_SIPI_H |
| 9 | #define _ASM_SIPI_H |
| 10 | |
| 11 | #define AP_DEFAULT_BASE 0x30000 |
| 12 | #define AP_DEFAULT_SIZE 0x10000 |
| 13 | |
| 14 | #ifndef __ASSEMBLER__ |
| 15 | |
| 16 | /** |
| 17 | * struct sipi_params_16bit - 16-bit SIPI entry-point parameters |
| 18 | * |
| 19 | * These are set up in the same space as the SIPI 16-bit code so that each AP |
| 20 | * can access the parameters when it boots. |
| 21 | * |
| 22 | * Each of these must be set up for the AP to boot, except @segment which is |
| 23 | * set in the assembly code. |
| 24 | * |
| 25 | * @ap_start: 32-bit SIPI entry point for U-Boot |
| 26 | * @segment: Code segment for U-Boot |
| 27 | * @pad: Padding (not used) |
| 28 | * @gdt_limit: U-Boot GDT limit (X86_GDT_SIZE - 1) |
| 29 | * @gdt: U-Boot GDT (gd->arch.gdt) |
| 30 | * @unused: Not used |
| 31 | */ |
| 32 | struct __packed sipi_params_16bit { |
| 33 | u32 ap_start; |
| 34 | u16 segment; |
| 35 | u16 pad; |
| 36 | u16 gdt_limit; |
| 37 | u32 gdt; |
| 38 | u16 unused; |
| 39 | }; |
| 40 | |
| 41 | /** |
| 42 | * struct sipi_params - 32-bit SIP entry-point parameters |
| 43 | * |
| 44 | * These are used by the AP init code and must be set up before the APs start. |
| 45 | * |
| 46 | * The stack area extends down from @stack_top, with @stack_size allocated |
| 47 | * for each AP. |
| 48 | * |
| 49 | * @idt_ptr: Interrupt descriptor table pointer |
| 50 | * @stack_top: Top of the AP stack area |
| 51 | * @stack_size: Size of each AP's stack |
| 52 | * @microcode_lock: Used to ensure only one AP loads microcode at once |
| 53 | * 0xffffffff enables parallel loading. |
| 54 | * @microcode_ptr: Pointer to microcode, or 0 if none |
| 55 | * @msr_table_ptr: Pointer to saved MSRs, a list of struct saved_msr |
| 56 | * @msr_count: Number of saved MSRs |
| 57 | * @c_handler: C function to call once early init is complete |
| 58 | * @ap_count: Shared atomic value to allocate CPU indexes |
| 59 | */ |
| 60 | struct sipi_params { |
| 61 | u32 idt_ptr; |
| 62 | u32 stack_top; |
| 63 | u32 stack_size; |
| 64 | u32 microcode_lock; |
| 65 | u32 microcode_ptr; |
| 66 | u32 msr_table_ptr; |
| 67 | u32 msr_count; |
| 68 | u32 c_handler; |
| 69 | atomic_t ap_count; |
| 70 | }; |
| 71 | |
| 72 | /* 16-bit AP entry point */ |
| 73 | void ap_start16(void); |
| 74 | |
| 75 | /* end of 16-bit code/data, marks the region to be copied to SIP vector */ |
| 76 | void ap_start16_code_end(void); |
| 77 | |
| 78 | /* 32-bit AP entry point */ |
| 79 | void ap_start(void); |
| 80 | |
| 81 | extern char sipi_params_16bit[]; |
| 82 | extern char sipi_params[]; |
| 83 | |
| 84 | #endif /* __ASSEMBLER__ */ |
| 85 | |
| 86 | #endif |