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Deshab-OS/CODE/UTSM/include/utsm/linux_loader.h
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#ifndef UTSM_LINUX_LOADER_H
#define UTSM_LINUX_LOADER_H
#include <utsm/types.h>
/* ===== Linux boot protocol structures (Documentation/x86/boot.rst) ===== */
/* bzImage setup_header — lives at offset 0x1f1 inside bzImage and boot_params.
* Only the fields we actually use are listed; gaps are reserved/padding. */
struct linux_setup_header {
u8 setup_sects; /* 0x1f1: number of setup sectors */
u16 root_flags; /* 0x1f2 */
u32 syssize; /* 0x1f4: protected-mode code size / 16 */
u16 ram_size; /* 0x1f8 */
u16 vid_mode; /* 0x1fa */
u16 boot_flag; /* 0x1fe: 0xAA55 */
u16 jump; /* 0x200: jump insn */
u32 header; /* 0x202: "HdrS" magic */
u16 version; /* 0x206: boot protocol version */
u32 realmode_swtch; /* 0x208 */
u16 start_sys_seg; /* 0x20c */
u16 kernel_version; /* 0x20e: offset to version string */
u8 type_of_loader; /* 0x210 */
u8 loadflags; /* 0x211 */
u16 setup_move_size; /* 0x212 */
u32 code32_start; /* 0x214: 32-bit entry (also 64-bit entry base) */
u32 ramdisk_image; /* 0x218 */
u32 ramdisk_size; /* 0x21c */
u32 bootsect_kludge; /* 0x220 */
u16 heap_end_ptr; /* 0x224 */
u8 ext_loader_ver; /* 0x226 */
u8 ext_loader_type; /* 0x227 */
u32 cmd_line_ptr; /* 0x228: command line physical address */
u32 init_size; /* 0x22c: total init memory needed */
u32 acpi_rsdp_addr; /* 0x230 */
u8 _pad0[4]; /* 0x234: relocatable_kernel + min_alignment */
u16 xloadflags; /* 0x236: bit0=XLF_KERNEL_64 */
u32 cmdline_size; /* 0x238 */
u32 _pad1; /* 0x23c */
u64 setup_data; /* 0x240: linked list of setup_data */
u64 pref_address; /* 0x248 → wait, this is payload_offset */
/* NOTE: The real layout continues with payload_offset at 0x248.
* However, pref_address is at 0x258 and init_size at 0x260.
* The struct above is intentionally simplified — we read fields
* by offset rather than relying on this struct for the full layout. */
} __attribute__((packed));
/* boot_params is 4096 bytes. The setup_header is at offset 0x1f1. */
#define BOOT_PARAMS_SIZE 4096
#define SETUP_HEADER_OFFSET 0x1f1
/* Key field offsets within bzImage / boot_params */
#define BZ_BOOT_FLAG_OFF 0x1fe
#define BZ_HEADER_MAGIC 0x53726448 /* "HdrS" */
#define BZ_HEADER_OFF 0x202
#define BZ_VERSION_OFF 0x206
#define BZ_TYPE_OF_LOADER_OFF 0x210
#define BZ_LOADFLAGS_OFF 0x211
#define BZ_CODE32_START_OFF 0x214
#define BZ_RAMDISK_IMAGE_OFF 0x218
#define BZ_RAMDISK_SIZE_OFF 0x21c
#define BZ_CMD_LINE_PTR_OFF 0x228
#define BZ_INIT_SIZE_OFF 0x22c /* wait — actually init_size is at 0x260 */
#define BZ_XLOADFLAGS_OFF 0x236
#define BZ_CMDLINE_SIZE_OFF 0x238
#define BZ_PAYLOAD_OFFSET_OFF 0x248
#define BZ_PAYLOAD_LENGTH_OFF 0x24c
#define BZ_PREF_ADDRESS_OFF 0x258
#define BZ_INIT_SIZE_ACTUAL_OFF 0x260
/* xloadflags bits */
#define XLF_KERNEL_64 0x0001
#define XLF_CAN_BE_LOADED_ABOVE 0x0002
#define XLF_EFI_HANDOVER 0x0010
#define XLF_EFI_KEXEC 0x0020
/* loadflags bits */
#define LOADFLAG_LOADED_HIGH 0x01
#define LOADFLAG_KEEP_ROOT 0x02
#define LOADFLAG_CAN_USE_HEAP 0x80
/* e820 entry types */
#define E820_TYPE_RAM 1
#define E820_TYPE_RESERVED 2
#define E820_TYPE_ACPI 3
#define E820_TYPE_NVS 4
#define E820_TYPE_UNUSABLE 5
#define E820_TYPE_PMEM 7
/* e820_table entry in boot_params at offset 0x2e0 (actually 0x2d0 in older,
* 0x2e0 in newer). We use 0x2e0 and the e820_entries count at 0x1e8.
* Each entry is 20 bytes: u64 addr, u64 size, u32 type. */
#define E820_ENTRIES_OFFSET 0x1e8
#define E820_TABLE_OFFSET 0x2e0
#define E820_MAX_ENTRIES 128
#define E820_ENTRY_SIZE 20
/* ===== Guest memory layout (GPA) =====
* Based on utsm-linux-dual-kernel-architecture.md.
* 0x00000000-0x003FFFFF : UTSM reserved (denied to Linux)
* 0x00400000-0x004FFFFF : boot_params / cmdline / GDT / page tables / stack
* 0x01000000-0x02FFFFFF : Linux kernel image
* 0x03000000-0x03FFFFFF : Linux initrd
* 0x04000000-0x040FFFFF : IPC shared memory (1MB, both kernels RW)
* 0x05000000-MAX : Linux general RAM
*/
#define LINUX_GUEST_KERNEL_GPA 0x01000000ULL /* 16 MB, 2MB-aligned */
#define LINUX_GUEST_BOOTPARAMS_GPA 0x00400000ULL /* 4 MB */
#define LINUX_GUEST_CMDLINE_GPA 0x00500000ULL /* 5 MB */
#define LINUX_GUEST_INITRD_GPA 0x03000000ULL /* 48 MB (within kernel+initrd region) */
#define LINUX_GUEST_STACK_GPA 0x00800000ULL /* 8 MB (stack grows down) */
#define LINUX_GUEST_GDT_GPA 0x00600000ULL /* 6 MB (guest GDT) */
#define LINUX_GUEST_PGT_GPA 0x00700000ULL /* 7 MB (guest page tables) */
#define LINUX_GUEST_CMDLINE_MAX 4096
/* IPC shared memory GPA (must match CODE/utsm-ipc/ipc_proto.h) */
#define LINUX_GUEST_IPC_SHM_GPA 0x04000000ULL /* 64 MB */
#define LINUX_GUEST_IPC_SHM_SIZE (1024 * 1024) /* 1MB */
/* General RAM starts after IPC region */
#define LINUX_GUEST_RAM_GPA 0x05000000ULL /* 80 MB */
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/* ===== virtio-mmio device GPA layout =====
* virtio-mmio 设备放在 GPA 高位 MMIO 区（guest RAM 之上，不占用 e820 RAM）。
* guest 通过 cmdline 参数 virtio_mmio.device= 发现这些设备。
* 每个设备占 0x200 字节寄存器空间（virtio-mmio 规范要求 4KB 对齐）。
*
* 这些 GPA 在 EPT 中【故意不映射】，访问时触发 EPT violation，
* 由 vmexit handler 路由到 virtio_mmio 后端模拟寄存器读写。
*
* GPA 选择 0xF4000000 起始（接近 4GB，远离 guest RAM 0x05000000-0x09000000）。 */
#define VIRTIO_MMIO_GPA_BASE 0xF4000000ULL
#define VIRTIO_MMIO_GPA_STRIDE 0x1000ULL /* 每个设备 4KB */
#define VIRTIO_MMIO_BLK_GPA (VIRTIO_MMIO_GPA_BASE + 0 * VIRTIO_MMIO_GPA_STRIDE) /* 0xF4000000 */
#define VIRTIO_MMIO_NET_GPA (VIRTIO_MMIO_GPA_BASE + 1 * VIRTIO_MMIO_GPA_STRIDE) /* 0xF4001000 */
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#define VIRTIO_MMIO_ROOTFS_GPA (VIRTIO_MMIO_GPA_BASE + 2 * VIRTIO_MMIO_GPA_STRIDE) /* 0xF4002000 */
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/* 判断 GPA 是否落在 virtio-mmio 设备区（含两端） */
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#define VIRTIO_MMIO_GPA_END (VIRTIO_MMIO_GPA_BASE + 3 * VIRTIO_MMIO_GPA_STRIDE)
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#define IS_VIRTIO_MMIO_GPA(gpa) ((gpa) >= VIRTIO_MMIO_GPA_BASE && (gpa) < VIRTIO_MMIO_GPA_END)
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/* ===== Linux loader API ===== */
/* Loaded Linux guest state */
struct linux_guest_info {
u64 kernel_gpa; /* GPA where kernel was loaded */
u64 kernel_entry; /* 64-bit entry point GPA */
u64 kernel_size; /* Size of loaded kernel image */
u64 bootparams_gpa; /* GPA of boot_params */
u64 cmdline_gpa; /* GPA of command line */
u64 cmdline_size; /* Command line length (with NUL) */
u64 initrd_gpa; /* GPA of initrd (0 = none) */
u64 initrd_size; /* Size of initrd */
u64 pgt_gpa; /* GPA of guest page tables */
u64 gdt_gpa; /* GPA of guest GDT */
int loaded; /* 1 = successfully loaded */
};
/* Find the Linux bzImage boot module among Limine modules.
* Returns pointer to the module data, or NULL if not found.
* Sets *size_out to the module size. */
void *linux_find_bzimage_module(u64 *size_out);
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/* Find the Arch rootfs image boot module (path contains "rootfs").
* Exposed to Linux guest via memory-backed virtio-blk as /dev/vdb. */
void *linux_find_rootfs_module(u64 *size_out);
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/* Parse bzImage header and extract key parameters.
* Returns 0 on success, negative on error. */
int linux_parse_bzimage(const void *bzimage, u64 size,
u64 *payload_offset_out, u64 *payload_length_out,
u64 *init_size_out, u64 *entry_offset_out);
/* Initialize the Linux guest: parse bzImage, allocate guest memory,
* set up boot_params, page tables, GDT, and EPT mappings.
* Returns 0 on success, negative on error. */
int linux_loader_init(void);
/* Get the loaded Linux guest info (NULL if not loaded). */
const struct linux_guest_info *linux_get_guest_info(void);
/* Configure VMCS for Linux guest and perform vmlaunch.
* Must be called after vmm_init() + linux_loader_init().
* Returns 0 on successful guest termination, negative on error. */
int linux_launch(void);
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/* Default Linux command line (can be overridden).
* nohlt: prevent kernel idle loop from using HLT — only the exec daemon's
* explicit ioctl(PARK) HLT should trigger VM-Exit park, so that
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* linux_launch() returns only after the daemon is ready.
* noapic/nolapic/nosmp: UTSM VMM 只模拟 legacy PIC(8259) + PIT(8254)，
* 不提供 LAPIC/IOAPIC；guest 走 XT-PIC 模式，IRQ vector = 0x30+irq。
* virtio_mmio.device=: 向 guest 声明 virtio-mmio 设备（blk@0xF4000000 IRQ5,
* net@0xF4001000 IRQ6），需 CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y。 */
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#define LINUX_DEFAULT_CMDLINE \
"console=ttyS0,115200 earlyprintk=serial nokaslr " \
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"no_timer_check loglevel=7 nohlt idle=poll " \
"noapic nolapic nosmp " \
"virtio_mmio.device=4K@0xF4000000:5 " \
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"virtio_mmio.device=4K@0xF4001000:6 " \
"virtio_mmio.device=4K@0xF4002000:7"
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#endif
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