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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef BOOT_H
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#define BOOT_H
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/*
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* Definitions used in the boot code. Also defines exported symbols needed
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* in the main code.
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*
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* Copyright (C) 2020 Martin Whitaker.
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*/
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#define MAX_APS 64 /* Maximum number of active APs. This
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only affects memory footprint, so
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can be increased if needed */
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#define BSP_STACK_SIZE 4096 /* Stack size for the BSP */
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#define AP_STACK_SIZE 2048 /* Stack size for each AP */
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#define LOW_LOAD_ADDR 0x00010000 /* The low load address for the main program */
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#define HIGH_LOAD_ADDR 0x00100000 /* The high load address for the main program */
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#define SETUP_SECS 2 /* Size of the 16-bit setup code in sectors */
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#define BOOT_SEG 0x07c0 /* Segment address for the 16-bit boot code */
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#define SETUP_SEG 0x07e0 /* Segment address for the 16-bit setup code */
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#define MAIN_SEG 0x1000 /* Segment address for the main program code
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when loaded by the 16-bit bootloader */
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#define KERNEL_CS 0x10 /* 32-bit segment address for code */
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#define KERNEL_DS 0x18 /* 32-bit segment address for data */
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/* The following addresses are offsets from BOOT_SEG. */
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#define BOOT_STACK ((1 + SETUP_SECS) * 512)
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#define BOOT_STACK_TOP ((MAIN_SEG - BOOT_SEG) << 4)
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/* The following definitions must match the Linux boot_params struct. */
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#define E820_ENTRIES 0x1e8 /* offsetof(boot_params.e820_entries) */
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#define E820_MAP 0x2d0 /* offsetof(boot_params.e820_table) */
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#define E820_MAP_SIZE 128 /* max. number of entries in E820_MAP */
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/* The following definitions must match the Linux e820_entry struct. */
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#define E820_ADDR 0 /* offsetof(e820_entry.addr) */
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#define E820_SIZE 8 /* offsetof(e820_entry.size) */
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#define E820_TYPE 16 /* offsetof(e820_entry.type) */
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#define E820_ENTRY_SIZE 20 /* sizeof(e820_entry) */
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#ifndef __ASSEMBLY__
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#include <stdint.h>
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extern uint8_t _start[];
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extern uint8_t startup[];
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extern uint64_t pml4[];
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extern uint64_t pdp[];
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extern uint64_t pd0[];
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extern uint64_t pd1[];
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extern uint64_t pd2[];
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extern uint64_t pd3[];
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extern uintptr_t boot_params_addr;
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extern uint8_t ap_trampoline[];
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extern uint32_t ap_startup_addr;
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extern uint8_t ap_trampoline_end[];
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extern uint8_t _end[];
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#endif /* ! __ASSEMBLY__ */
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#endif /* BOOT_H */
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