80 lines
3.3 KiB
C
80 lines
3.3 KiB
C
/*********************************************************************************/
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/* Module Name: aurix.c */
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/* Project: AurixOS */
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/* */
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/* Copyright (c) 2024-2025 Jozef Nagy */
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/* */
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/* This source is subject to the MIT License. */
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/* See License.txt in the root of this repository. */
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/* All other rights reserved. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
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/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
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/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */
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/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
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/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
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/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */
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/* SOFTWARE. */
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/*********************************************************************************/
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#include <proto/aurix.h>
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#include <loader/elf.h>
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#include <mm/mman.h>
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#include <mm/vmm.h>
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#include <vfs/vfs.h>
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#include <print.h>
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#include <axboot.h>
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#include <efi.h>
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#include <efilib.h>
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extern __attribute__((noreturn)) void aurix_handoff(void *pagemap, void *stack, uint64_t entry, void *params);
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extern char _aurix_handoff_start[], _aurix_handoff_end[];
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void aurix_load(char *kernel)
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{
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// read kernel -> test read
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char *kbuf = NULL;
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vfs_read(kernel, &kbuf);
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// TODO: Do something with the kernel :p
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pagetable *pm = create_pagemap();
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// __asm__ volatile("mov %%cr3, %0" : "=r"(pm));
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if (!pm) {
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debug("aurix_load(): Failed to create kernel pagemap! Halting...\n");
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// TODO: Halt
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while (1);
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}
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map_pages(pm, (uintptr_t)pm, (uintptr_t)pm, PAGE_SIZE, VMM_WRITABLE);
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map_pages(pm, (uintptr_t)_aurix_handoff_start, (uintptr_t)_aurix_handoff_start, (uint64_t)_aurix_handoff_end - (uint64_t)_aurix_handoff_start, 0);
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void *stack = mem_alloc(16*1024); // 16 KiB stack should be well more than enough
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if (!stack) {
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debug("aurix_load(): Failed to allocate stack! Halting...\n");
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while (1);
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}
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map_pages(pm, (uintptr_t)stack, (uintptr_t)stack, 16*1024, VMM_WRITABLE | VMM_NX);
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void *kernel_entry = (void *)elf_load(kbuf, pm);
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if (!kernel_entry) {
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debug("aurix_load(): Failed to load '%s'! Halting...\n", kernel);
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mem_free(kbuf);
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while (1);
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}
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void *parameters = NULL;
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debug("aurix_load(): Handoff state: pm=0x%llx, stack=0x%llx, kernel_entry=0x%llx\n", pm, stack, kernel_entry);
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// this triggers a #GP ????
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// aurix_handoff(pm, stack, (uint64_t)kernel_entry, (void *)parameters);
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// __builtin_unreachable();
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__asm__ volatile("movq %[pml4], %%cr3\n"
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"movq %[stack], %%rsp\n"
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"callq *%[entry]\n"
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:: [pml4]"r"(pm), [stack]"r"(stack), [entry]"r"(kernel_entry) : "memory");
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// __asm__ volatile("callq *%[entry]\n"
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// :: [entry]"r"(kernel_entry));
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}
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