zephyr/arch/x86/core/multiboot.c

142 lines
3.6 KiB
C

/*
* Copyright (c) 2019 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <string.h>
#include <zephyr/arch/x86/multiboot.h>
#include <zephyr/arch/x86/memmap.h>
struct multiboot_info multiboot_info;
#ifdef CONFIG_DYNAMIC_BOOTARGS
__pinned_noinit char multiboot_cmdline[CONFIG_BOOTARGS_ARGS_BUFFER_SIZE];
const char *get_bootargs(void)
{
return multiboot_cmdline;
}
#endif /* CONFIG_DYNAMIC_BOOTARGS */
/*
* called very early in the boot process to fetch data out of the multiboot
* info struct. we need to grab the relevant data before any dynamic memory
* allocation takes place, lest the struct itself or any data it points to
* be overwritten before we read it.
*/
static inline void clear_memmap(int index)
{
while (index < CONFIG_X86_MEMMAP_ENTRIES) {
x86_memmap[index].type = X86_MEMMAP_ENTRY_UNUSED;
++index;
}
}
void z_multiboot_init(struct multiboot_info *info_pa)
{
struct multiboot_info *info;
#if defined(CONFIG_ARCH_MAPS_ALL_RAM) || !defined(CONFIG_X86_MMU)
/*
* Since the struct from bootloader resides in memory
* and all memory is mapped, there is no need to
* manually map it before accessing.
*
* Without MMU, all memory are identity-mapped already
* so there is no need to map them again.
*/
info = info_pa;
#else
k_mem_map_phys_bare((uint8_t **)&info, POINTER_TO_UINT(info_pa),
sizeof(*info_pa), K_MEM_CACHE_NONE);
#endif /* CONFIG_ARCH_MAPS_ALL_RAM */
if (info == NULL) {
return;
}
memcpy(&multiboot_info, info, sizeof(*info));
#ifdef CONFIG_MULTIBOOT_MEMMAP
/*
* If the extended map (basically, the equivalent of
* the BIOS E820 map) is available, then use that.
*/
if ((info->flags & MULTIBOOT_INFO_FLAGS_MMAP) &&
(x86_memmap_source < X86_MEMMAP_SOURCE_MULTIBOOT_MMAP)) {
uintptr_t address;
uintptr_t address_end;
struct multiboot_mmap *mmap;
int index = 0;
uint32_t type;
#if defined(CONFIG_ARCH_MAPS_ALL_RAM) || !defined(CONFIG_X86_MMU)
address = info->mmap_addr;
#else
uint8_t *address_va;
k_mem_map_phys_bare(&address_va, info->mmap_addr, info->mmap_length,
K_MEM_CACHE_NONE);
address = POINTER_TO_UINT(address_va);
#endif /* CONFIG_ARCH_MAPS_ALL_RAM */
address_end = address + info->mmap_length;
while ((address < address_end) &&
(index < CONFIG_X86_MEMMAP_ENTRIES)) {
mmap = UINT_TO_POINTER(address);
x86_memmap[index].base = mmap->base;
x86_memmap[index].length = mmap->length;
switch (mmap->type) {
case MULTIBOOT_MMAP_RAM:
type = X86_MEMMAP_ENTRY_RAM;
break;
case MULTIBOOT_MMAP_ACPI:
type = X86_MEMMAP_ENTRY_ACPI;
break;
case MULTIBOOT_MMAP_NVS:
type = X86_MEMMAP_ENTRY_NVS;
break;
case MULTIBOOT_MMAP_DEFECTIVE:
type = X86_MEMMAP_ENTRY_DEFECTIVE;
break;
default:
type = X86_MEMMAP_ENTRY_UNKNOWN;
}
x86_memmap[index].type = type;
++index;
address += mmap->size + sizeof(mmap->size);
}
x86_memmap_source = X86_MEMMAP_SOURCE_MULTIBOOT_MMAP;
clear_memmap(index);
}
/* If no extended map is available, fall back to the basic map. */
if ((info->flags & MULTIBOOT_INFO_FLAGS_MEM) &&
(x86_memmap_source < X86_MEMMAP_SOURCE_MULTIBOOT_MEM)) {
x86_memmap[0].base = 0;
x86_memmap[0].length = info->mem_lower * 1024ULL;
x86_memmap[0].type = X86_MEMMAP_ENTRY_RAM;
if (CONFIG_X86_MEMMAP_ENTRIES > 1) {
x86_memmap[1].base = 1048576U; /* 1MB */
x86_memmap[1].length = info->mem_upper * 1024ULL;
x86_memmap[1].type = X86_MEMMAP_ENTRY_RAM;
clear_memmap(2);
}
x86_memmap_source = X86_MEMMAP_SOURCE_MULTIBOOT_MEM;
}
#endif /* CONFIG_MULTIBOOT_MEMMAP */
}