166 lines
4.9 KiB
C
166 lines
4.9 KiB
C
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#ifndef _BOOTLOADER_H_
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#define _BOOTLOADER_H_
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/************************
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*** Team Kitty, 2020 ***
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*** Chroma ***
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***********************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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;* Memory map
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;* 0h - 600h reserved for the system
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;* 600h - 800h stage1 (MBR/VBR, boot.bin)
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;* 800h - 6C00h stage2 (this)
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;* 6C00h - 7C00h stack (7000h - 700Fh SMP trampoline code)
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;* 8000h - 9000h bootboot structure
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;* 9000h - A000h environment
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* V----------- CAN REMOVE -----------V
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;* A000h - B000h disk buffer / PML4
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;* B000h - C000h PDPE, higher half core 4K slots
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;* C000h - D000h PDE 4K
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;* D000h - E000h PTE 4K
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;* E000h - F000h PDPE, 4G physical RAM identity mapped 2M
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;* F000h - 10000h PDE 2M
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;* 10000h - 11000h PDE 2M
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;* 11000h - 12000h PDE 2M
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;* 12000h - 13000h PDE 2M
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;* 13000h - 14000h PTE 4K
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* ∧----------- CAN REMOVE -----------∧
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;* 14000h - 9F000h core stacks (1k per core)
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;*
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;* At first big enough free hole, initrd. Usually at 1Mbyte.
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*/
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/* ELF headers hate me.
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* Let's do this the hard way. */
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#define ELF_IDENT_MAGIC_OFF 0x0
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#define ELF_IDENT_CLASS_OFF 0x4
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#define ELF_IDENT_DATA_OFF 0x5
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#define ELF_IDENT_VERSION_OFF 0x6
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#define ELF_IDENT_OSABI_OFF 0x7
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#define ELF_IDENT_ABI_VERSION_OFF 0x8
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#define ELF_IDENT_PAD_OFF 0x9
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#define ELFTYPE_OFF 0x10
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#define ELFMACHINE_OFF 0x12
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#define ELFVERSION_OFF 0x14
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#define ELFENTRY_OFF 0x18
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#define ELFPHOFF_OFF 0x20
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#define ELFSHOFF_OFF 0x28
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#define ELFFLAGS_OFF 0x30
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#define ELFEHSIZE_OFF 0x34
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#define ELFPHENTSIZE_OFF 0x36
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#define ELFPHNUM_OFF 0x38
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#define ELFSHENTSIZE_OFF 0x3A
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#define ELFSHNUM_OFF 0x3C
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#define ELFSHSTRNDX_OFF 0x40
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#define BOOT_MAGIC "BOOT"
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/* minimum protocol level:
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* hardcoded kernel name, static kernel memory addresses
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* this is the default */
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#define PROTOCOL_MINIMAL 0
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/* static protocol level:
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* kernel name parsed from environment, static kernel memory addresses */
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#define PROTOCOL_STATIC 1
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/* dynamic protocol level:
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* kernel name parsed, kernel memory addresses from ELF or PE symbols */
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#define PROTOCOL_DYNAMIC 2
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/* big-endian flag */
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#define PROTOCOL_BIGENDIAN 0x80
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/* loader types, just informational */
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#define LOADER_BIOS (0<<2)
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/* unless we get to a weird stage, these should never be used. */
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#define LOADER_UEFI (1<<2)
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#define LOADER_RPI (2<<2)
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/* framebuffer pixel format, only 32 bits supported */
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#define FB_ARGB 0
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#define FB_RGBA 1
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#define FB_ABGR 2
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#define FB_BGRA 3
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/* mmap entry, type is stored in least significant tetrad (half byte) of size
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* this means size described in 16 byte units (not a problem, most modern
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* firmware report memory in pages, 4096 byte units anyway). */
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typedef struct {
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uint64_t ptr;
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uint64_t size;
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} __attribute__((packed)) MMapEnt;
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#define MMapEnt_Ptr(a) (a->ptr)
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#define MMapEnt_Size(a) (a->size & 0xFFFFFFFFFFFFFFF0)
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#define MMapEnt_Type(a) (a->size & 0xF)
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#define MMapEnt_IsFree(a) ((a->size&0xF)==1)
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#define MMAP_USED 0 /* don't use. Reserved or unknown regions */
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#define MMAP_FREE 1 /* usable memory */
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#define MMAP_ACPI 2 /* acpi memory, volatile and non-volatile as well */
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#define MMAP_MMIO 3 /* memory mapped IO region */
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#define INITRD_MAXSIZE 16 /* Mb */
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typedef struct {
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/* first 64 bytes is platform independent */
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uint8_t magic[4]; /* 'BOOT' magic */
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uint32_t size; /* length of bootboot structure, minimum 128 */
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uint8_t protocol; /* 1, static addresses, see PROTOCOL_* and LOADER_* above */
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uint8_t fb_type; /* framebuffer type, see FB_* above */
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uint16_t numcores; /* number of processor cores */
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uint16_t bspid; /* Bootsrap processor ID (Local APIC Id on x86_64) */
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int16_t timezone; /* in minutes -1440..1440 */
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uint8_t datetime[8]; /* in BCD yyyymmddhhiiss UTC (independent to timezone) */
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uint64_t initrd_ptr; /* ramdisk image position and size */
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uint64_t initrd_size;
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uint8_t *fb_ptr; /* framebuffer pointer and dimensions */
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uint32_t fb_size;
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uint32_t fb_width;
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uint32_t fb_height;
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uint32_t fb_scanline;
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/* the rest (64 bytes) is platform specific */
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union {
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struct {
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uint64_t acpi_ptr;
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uint64_t smbi_ptr;
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uint64_t efi_ptr;
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uint64_t mp_ptr;
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uint64_t unused0;
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uint64_t unused1;
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uint64_t unused2;
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uint64_t unused3;
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} x86_64;
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struct {
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uint64_t acpi_ptr;
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uint64_t mmio_ptr;
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uint64_t efi_ptr;
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uint64_t unused0;
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uint64_t unused1;
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uint64_t unused2;
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uint64_t unused3;
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uint64_t unused4;
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} aarch64;
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} arch;
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/* from 128th byte, MMapEnt[], more records may follow */
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MMapEnt mmap;
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/* use like this:
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* MMapEnt *mmap_ent = &bootboot.mmap; mmap_ent++;
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* until you reach bootboot->size */
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} __attribute__((packed)) bootinfo;
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#ifdef __cplusplus
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}
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#endif
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#endif
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