1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (c) 2015 Gooogle, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7 #ifndef _ASM_SIPI_H 8 #define _ASM_SIPI_H 9 10 #define AP_DEFAULT_BASE 0x30000 11 #define AP_DEFAULT_SIZE 0x10000 12 13 #ifndef __ASSEMBLER__ 14 15 /** 16 * struct sipi_params_16bit - 16-bit SIPI entry-point parameters 17 * 18 * These are set up in the same space as the SIPI 16-bit code so that each AP 19 * can access the parameters when it boots. 20 * 21 * Each of these must be set up for the AP to boot, except @segment which is 22 * set in the assembly code. 23 * 24 * @ap_start: 32-bit SIPI entry point for U-Boot 25 * @segment: Code segment for U-Boot 26 * @pad: Padding (not used) 27 * @gdt_limit: U-Boot GDT limit (X86_GDT_SIZE - 1) 28 * @gdt: U-Boot GDT (gd->arch.gdt) 29 * @unused: Not used 30 */ 31 struct __packed sipi_params_16bit { 32 u32 ap_start; 33 u16 segment; 34 u16 pad; 35 u16 gdt_limit; 36 u32 gdt; 37 u16 unused; 38 }; 39 40 /** 41 * struct sipi_params - 32-bit SIP entry-point parameters 42 * 43 * These are used by the AP init code and must be set up before the APs start. 44 * The members must match with the sipi_params layout in sipi_vector.S. 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 87