feat(amd64): add more limine support

src/platform/boot/limine/entry.zig

@@ -1,5 +1,6 @@
 const b = @import("base");
 const ksyms = @import("ksyms");
+const limine = @import("limine.zig");
 
 const pl = b.pl;
 const ke = b.ke;
@@ -12,8 +13,91 @@ const std = @import("std");
 
 var boot_info: pl.BootInfo = undefined;
 
+pub export var limine_base_revision: [3]u64 linksection(".limine_requests") = limine.base_revision(6);
+
+pub export var framebuffer_request: limine.FramebufferRequest linksection(".limine_requests") = .{
+    .id = limine.framebuffer_request_id,
+    .revision = 0,
+    .response = null,
+};
+
+pub export var limine_requests_start_marker: [4]u64 linksection(".limine_requests_start") = limine.requests_start_marker;
+pub export var limine_requests_end_marker: [2]u64 linksection(".limine_requests_end") = limine.requests_end_marker;
+
+pub export var memmap_request: limine.MemmapRequest linksection(".limine_requests") = .{
+    .id = limine.memmap_request_id,
+    .revision = 0,
+    .response = null,
+};
+
+pub export var rsdp_request: limine.RsdpRequest linksection(".limine_requests") = .{
+    .id = limine.rsdp_request_id,
+    .revision = 0,
+    .response = null,
+};
+
+pub export var cmdline_request: limine.CmdlineRequest linksection(".limine_requests") = .{
+    .id = limine.cmdline_request_id,
+    .revision = 0,
+    .response = null,
+};
+
+pub export var kernel_address_request: limine.KernelAddressRequest linksection(".limine_requests") = .{
+    .id = limine.kernel_address_request_id,
+    .revision = 0,
+    .response = null,
+};
+
+fn build_memory_map() void {
+    const memmap_response = memmap_request.response orelse {
+        @panic("Limine memmap request failed");
+    };
+
+    boot_info.memory_map.entry_count = memmap_response.entry_count;
+    const entries = memmap_response.entries orelse {
+        @panic("Limine memmap response has no entries");
+    };
+
+    for (0..memmap_response.entry_count) |i| {
+        const entry = entries[i];
+        boot_info.memory_map.entries[i] = .{
+            .base = entry.base,
+            .size = entry.length,
+            .type = switch (entry.type) {
+                .Usable => pl.BootInfo.MemMap.Entry.Type.Free,
+                .AcpiReclaimable => pl.BootInfo.MemMap.Entry.Type.AcpiReclaimable,
+                .AcpiNvs => pl.BootInfo.MemMap.Entry.Type.AcpiNvs,
+                .BootloaderReclaimable => pl.BootInfo.MemMap.Entry.Type.LoaderReclaimable,
+                .KernelAndModules => pl.BootInfo.MemMap.Entry.Type.Kernel,
+                else => pl.BootInfo.MemMap.Entry.Type.Reserved,
+            },
+        };
+    }
+}
+
 export fn kmain() callconv(.c) void {
-    boot_info.memory_map.entry_count = 0;
+    boot_info.cmdline = if (cmdline_request.response) |cmdline_response| {
+        cmdline_response.cmdline;
+    } else {
+        null;
+    };
+
+    boot_info.rsdp = if (rsdp_request.response) |rsdp_response| {
+        rsdp_response.rsdp;
+    } else {
+        0;
+    };
+
+    boot_info.kernel_address = if (kernel_address_request.response) |ka_response| {
+        .{
+            .physical_base = ka_response.kernel_address.physical_base,
+            .virtual_base = ka_response.kernel_address.virtual_base,
+        };
+    } else {
+        .{ .physical_base = 0, .virtual_base = 0 };
+    };
+
+    build_memory_map();
 
     var cpus: [1]*ke.Cpu = .{&ke.private.bootstrap_cpu};
 

src/platform/boot/limine/limine.zig

@@ -15,7 +15,7 @@ pub const requests_end_marker: [2]u64 = .{
     0x9572709f31764c62,
 };
 
-pub fn baseRevision(rev: u64) [3]u64 {
+pub fn base_revision(rev: u64) [3]u64 {
     return .{
         0xf9562b2d5c95a6c8,
         0x6a7b384944536bdc,
@@ -23,11 +23,102 @@ pub fn baseRevision(rev: u64) [3]u64 {
     };
 }
 
-pub fn baseRevisionSupported(base_rev: *const [3]u64) bool {
-    // Limine will overwrite base_rev[2] with 0 if it supports the requested revision.
+pub fn base_revision_supported(base_rev: *const [3]u64) bool {
     return base_rev[2] == 0;
 }
 
+pub const memmap_request_id: [4]u64 = .{
+    common_magic[0],
+    common_magic[1],
+    0x67cf3d9d378a806f,
+    0xe304acdfc50c3c62,
+};
+
+pub const MemmapRequest = extern struct {
+    id: [4]u64,
+    revision: u64,
+    response: ?*MemmapResponse,
+};
+
+pub const MemmapResponse = extern struct {
+    revision: u64,
+    entry_count: u64,
+    entries: ?[*]*MemmapEntry,
+};
+
+pub const MemmapEntryType = enum(u64) {
+    Usable = 0,
+    Reserved = 1,
+    AcpiReclaimable = 2,
+    AcpiNvs = 3,
+    BadMemory = 4,
+    BootloaderReclaimable = 5,
+    KernelAndModules = 6,
+    Framebuffer = 7,
+    ReservedMapped = 8,
+};
+
+pub const MemmapEntry = extern struct {
+    base: u64,
+    length: u64,
+    type: MemmapEntryType,
+};
+
+pub const rsdp_request_id: [4]u64 = .{
+    common_magic[0],
+    common_magic[1],
+    0xc5e77b6b397e7b43,
+    0x27637845accdcf3c,
+};
+
+pub const RsdpRequest = extern struct {
+    id: [4]u64,
+    revision: u64,
+    response: ?*RsdpResponse,
+};
+
+pub const RsdpResponse = extern struct {
+    revision: u64,
+    rsdp_address: ?*anyopaque,
+};
+
+pub const cmdline_request_id: [4]u64 = .{
+    common_magic[0],
+    common_magic[1],
+    0x4b161536e598651e,
+    0xb390ad4a2f1f303a,
+};
+
+pub const CmdlineRequest = extern struct {
+    id: [4]u64,
+    revision: u64,
+    response: ?*CmdlineResponse,
+};
+
+pub const CmdlineResponse = extern struct {
+    revision: u64,
+    cmdline: ?[*]u8,
+};
+
+pub const executable_address_request_id: [4]u64 = .{
+    common_magic[0],
+    common_magic[1],
+    0x71ba76863cc55f63,
+    0xb2644a48c516a487,
+};
+
+pub const ExecutableAddressRequest = extern struct {
+    id: [4]u64,
+    revision: u64,
+    response: ?*ExecutableAddressResponse,
+};
+
+pub const ExecutableAddressResponse = extern struct {
+    revision: u64,
+    physical_base: u64,
+    virtual_base: u64,
+};
+
 pub const framebuffer_request_id: [4]u64 = .{
     common_magic[0],
     common_magic[1],
@@ -63,8 +154,4 @@ pub const Framebuffer = extern struct {
     unused: [7]u8,
     edid_size: u64,
     edid: ?*anyopaque,
-    // Response revision 1 fields (ignored by this template).
-    mode_count: u64,
-    modes: ?[*]*anyopaque,
 };
-