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// SPDX-License-Identifier: GPL-2.0
#ifndef BOOT_H
#define BOOT_H
/**
* \file
*
* Provides definitions used in the boot code. Also defines exported symbols
* needed in the main code.
*
*//*
* Copyright (C) 2020-2022 Martin Whitaker.
*/
/*
* NOTE: Increasing the value of MAX_APS would require:
* - relocating the stacks when the program is loaded in low memory
* - modifying smp.c to support the x2APIC architecture
* - adjusting the display if more than 3 digits are needed for CPU IDs
*/
#define MAX_APS 255 /* Maximum number of active APs */
#define BSP_STACK_SIZE 16384 /* Stack size for the BSP */
#ifdef __loongarch_lp64
#define AP_STACK_SIZE 2048 /* Stack size for each AP */
#else
#define AP_STACK_SIZE 1024 /* Stack size for each AP */
#endif
#define STACKS_SIZE (BSP_STACK_SIZE + MAX_APS * AP_STACK_SIZE)
#define LOCALS_SIZE 16 /* Stack region reserved for thread-local storage */
#define LOW_LOAD_ADDR 0x00010000 /* The low load address for the main program */
#define HIGH_LOAD_ADDR 0x00100000 /* The high load address for the main program */
#define SETUP_SECS 2 /* Size of the 16-bit setup code in sectors */
#define BOOT_SEG 0x07c0 /* Segment address for the 16-bit boot code */
#define SETUP_SEG 0x07e0 /* Segment address for the 16-bit setup code */
#define MAIN_SEG 0x1000 /* Segment address for the main program code
when loaded by the 16-bit bootloader */
#define KERNEL_CS 0x10 /* 32-bit segment address for code */
#define KERNEL_DS 0x18 /* 32-bit segment address for data */
/* The following addresses are offsets from BOOT_SEG. */
#define BOOT_STACK ((1 + SETUP_SECS) * 512)
#define BOOT_STACK_TOP ((MAIN_SEG - BOOT_SEG) << 4)
/* The following definitions must match the Linux boot_params struct. */
#define E820_ENTRIES 0x1e8 /* offsetof(boot_params.e820_entries) */
#define E820_MAP 0x2d0 /* offsetof(boot_params.e820_table) */
#define E820_MAP_SIZE 128 /* max. number of entries in E820_MAP */
/* The following definitions must match the Linux e820_entry struct. */
#define E820_ADDR 0 /* offsetof(e820_entry.addr) */
#define E820_SIZE 8 /* offsetof(e820_entry.size) */
#define E820_TYPE 16 /* offsetof(e820_entry.type) */
#define E820_ENTRY_SIZE 20 /* sizeof(e820_entry) */
#ifndef __ASSEMBLY__
#include <stdint.h>
extern uint8_t _start[];
extern uint8_t startup32[];
extern uint8_t startup64[];
extern uint8_t startup[];
extern uint64_t pml4[];
extern uint64_t pdp[];
extern uint64_t pd0[];
extern uint64_t pd1[];
extern uint64_t pd2[];
extern uint64_t pd3[];
extern uintptr_t boot_params_addr;
extern uint8_t ap_trampoline[];
extern uint32_t ap_startup_addr;
extern uint8_t ap_trampoline_end[];
extern uint8_t _stacks[];
extern uint8_t _end[];
#endif /* ! __ASSEMBLY__ */
#endif /* BOOT_H */
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