LXR uboot/arch/x86/include/asm/sipi.h

   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 */
  31struct __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 */
  60struct 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 */
  73void ap_start16(void);
  74
  75/* end of 16-bit code/data, marks the region to be copied to SIP vector */
  76void ap_start16_code_end(void);
  77
  78/* 32-bit AP entry point */
  79void ap_start(void);
  80
  81extern char sipi_params_16bit[];
  82extern char sipi_params[];
  83
  84#endif /* __ASSEMBLER__ */
  85
  86#endif
  87