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Loïc Grégoire
2026-10-07 18:03:06 -04:00
parent 6cd9117a05
commit 619c373d47
78 changed files with 1676 additions and 1118 deletions
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src/loader/limine/impl.zig
+107 -69
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@@ -1,56 +1,70 @@
//! Limine-specific code for the loader.
const std = @import("std");
const limine = @import("limine.zig");
const r = @import("root");
pub export var limine_base_revision: [3]u64 linksection(".limine_requests") = limine.base_revision(6);
pub export var 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 framebuffer_request linksection(".limine_requests") =
limine.FramebufferRequest{
.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 start_marker: [4]u64 linksection(".limine_requests_start") =
limine.requests_start_marker;
pub export var memmap_request: limine.MemmapRequest linksection(".limine_requests") = .{
.id = limine.memmap_request_id,
.revision = 0,
.response = null,
};
pub export var end_marker: [2]u64 linksection(".limine_requests_end") =
limine.requests_end_marker;
pub export var rsdp_request: limine.RsdpRequest linksection(".limine_requests") = .{
.id = limine.rsdp_request_id,
.revision = 0,
.response = null,
};
pub export var memmap_request linksection(".limine_requests") =
limine.MemmapRequest{
.id = limine.memmap_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 rsdp_request linksection(".limine_requests") =
limine.RsdpRequest{
.id = limine.rsdp_request_id,
.revision = 0,
.response = null,
};
pub export var hhdm_request: limine.HHDMRequest linksection(".limine_requests") = .{
.id = limine.hhdm_request_id,
.revision = 0,
.response = null,
};
pub export var cmdline_request linksection(".limine_requests") =
limine.CmdlineRequest{
.id = limine.cmdline_request_id,
.revision = 0,
.response = null,
};
pub export var kernel_request: limine.ExecutableAddressRequest linksection(".limine_requests") = .{
.id = limine.executable_address_request_id,
.revision = 0,
.response = null,
};
pub export var hhdm_request linksection(".limine_requests") =
limine.HHDMRequest{
.id = limine.hhdm_request_id,
.revision = 0,
.response = null,
};
pub export var module_request: limine.ModuleRequest linksection(".limine_requests") = .{
.id = limine.module_request_id,
.revision = 0,
.response = null,
};
pub export var kernel_request linksection(".limine_requests") =
limine.ExecutableAddressRequest{
.id = limine.executable_address_request_id,
.revision = 0,
.response = null,
};
pub export var module_request linksection(".limine_requests") =
limine.ModuleRequest{
.id = limine.module_request_id,
.revision = 0,
.response = null,
};
var hhdm_offset: usize = 0;
pub fn p2v(pa: usize) usize {
return hhdm_request.response.?.offset + pa;
return hhdm_offset + pa;
}
pub fn get_image_layout() r.ImageLayout {
@@ -64,36 +78,12 @@ pub fn get_image_layout() r.ImageLayout {
var cmdline: [256]u8 = undefined;
export fn loader_entry() callconv(.c) void {
var kernel: ?*anyopaque = null;
var module_start: usize = 0;
var module_end: usize = 0;
if (module_request.response) |resp| {
const modules = resp.modules.?[0..resp.module_count];
for (modules) |mod| {
if (std.mem.eql(u8, std.mem.span(mod.string), "kernel")) {
kernel = mod.address;
const phys = @intFromPtr(mod.address) -
hhdm_request.response.?.offset;
const size: usize = @intCast(mod.size);
module_start = std.mem.alignForward(usize, phys, r.page_size);
module_end = std.mem.alignBackward(usize, phys + size, r.page_size);
break;
}
}
}
if (kernel == null) {
@panic("loader: kernel not found");
}
const mmap = memmap_request.response.?;
fn build_mmap(module_start: usize, module_end: usize) void {
const mmap = memmap_request.response orelse unreachable;
const entries = mmap.entries orelse unreachable;
for (0..mmap.entry_count) |i| {
const entry = mmap.entries.?[i];
const entry = entries[i];
if (entry.type == .KernelAndModules) {
const end = entry.base + entry.length;
@@ -112,10 +102,18 @@ export fn loader_entry() callconv(.c) void {
// anyway.
if (reclaim_start < reclaim_end) {
if (entry.base < reclaim_start) {
r.mem.add_entry(entry.base, reclaim_start - entry.base, .Reserved);
r.mem.add_entry(
entry.base,
reclaim_start - entry.base,
.Reserved,
);
}
r.mem.add_entry(reclaim_start, reclaim_end - reclaim_start, .LoaderReclaimable);
r.mem.add_entry(
reclaim_start,
reclaim_end - reclaim_start,
.LoaderReclaimable,
);
if (reclaim_end < end) {
r.mem.add_entry(reclaim_end, end - reclaim_end, .Reserved);
@@ -132,6 +130,46 @@ export fn loader_entry() callconv(.c) void {
else => .Reserved,
});
}
}
export fn loader_entry() callconv(.c) void {
var kernel: ?*anyopaque = null;
var module_start: usize = 0;
var module_end: usize = 0;
const hhdm_resp = hhdm_request.response orelse unreachable;
hhdm_offset = hhdm_resp.offset;
if (module_request.response) |resp| {
const limine_mods = resp.modules orelse unreachable;
const modules = limine_mods[0..resp.module_count];
for (modules) |mod| {
if (std.mem.eql(u8, std.mem.span(mod.string), "kernel")) {
kernel = mod.address;
const phys = @intFromPtr(mod.address) - hhdm_offset;
const size: usize = @intCast(mod.size);
module_start = std.mem.alignForward(
usize,
phys,
r.page_size,
);
module_end = std.mem.alignBackward(
usize,
phys + size,
r.page_size,
);
break;
}
}
}
if (kernel == null) {
@panic("loader: kernel not found");
}
build_mmap(module_start, module_end);
if (framebuffer_request.response) |resp| {
const fb = resp.framebuffers[0];