54 lines
1.9 KiB
Zig
54 lines
1.9 KiB
Zig
const multiboot = @import("../../../src/kernel/multiboot.zig");
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pub const MemProfile = struct {
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vaddr_end: [*]u8,
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vaddr_start: [*]u8,
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physaddr_end: [*]u8,
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physaddr_start: [*]u8,
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mem_kb: u32,
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fixed_alloc_size: u32,
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mem_map: []multiboot.multiboot_memory_map_t,
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boot_modules: []multiboot.multiboot_module_t,
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};
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// The virtual/physical start/end of the kernel code
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var KERNEL_PHYSADDR_START: u32 = 0x00100000;
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var KERNEL_PHYSADDR_END: u32 = 0x01000000;
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var KERNEL_VADDR_START: u32 = 0xC0100000;
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var KERNEL_VADDR_END: u32 = 0xC1100000;
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var KERNEL_ADDR_OFFSET: u32 = 0xC0000000;
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// The size of the fixed allocator used before the heap is set up. Set to 1MiB.
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const FIXED_ALLOC_SIZE = 1024 * 1024;
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pub fn init(mb_info: *multiboot.multiboot_info_t) MemProfile {
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return MemProfile{
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.vaddr_end = @ptrCast([*]u8, &KERNEL_VADDR_END),
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.vaddr_start = @ptrCast([*]u8, &KERNEL_VADDR_START),
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.physaddr_end = @ptrCast([*]u8, &KERNEL_PHYSADDR_END),
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.physaddr_start = @ptrCast([*]u8, &KERNEL_PHYSADDR_START),
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// Total memory available including the initial 1MiB that grub doesn't include
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.mem_kb = mb_info.mem_upper + mb_info.mem_lower + 1024,
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.fixed_alloc_size = FIXED_ALLOC_SIZE,
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.mem_map = undefined,
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.boot_modules = undefined,
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};
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}
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pub fn virtToPhys(virt: var) @TypeOf(virt) {
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const T = @TypeOf(virt);
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return switch (@typeInfo(T)) {
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.Pointer => @intToPtr(T, @ptrToInt(virt) - KERNEL_ADDR_OFFSET),
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.Int => virt - KERNEL_ADDR_OFFSET,
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else => @compileError("Only pointers and integers are supported"),
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};
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}
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pub fn physToVirt(phys: var) @TypeOf(phys) {
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const T = @TypeOf(phys);
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return switch (@typeInfo(T)) {
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.Pointer => @intToPtr(T, @ptrToInt(phys) + KERNEL_ADDR_OFFSET),
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.Int => phys + KERNEL_ADDR_OFFSET,
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else => @compileError("Only pointers and integers are supported"),
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};
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}
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