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390 lines
9.5 KiB
390 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (c) 2015 Google, Inc |
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* |
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* EFI information obtained here: |
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* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES |
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* |
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* Loads a payload (U-Boot) within the EFI environment. This is built as an |
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* EFI application. It can be built either in 32-bit or 64-bit mode. |
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*/ |
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#include <common.h> |
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#include <debug_uart.h> |
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#include <efi.h> |
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#include <efi_api.h> |
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#include <errno.h> |
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#include <ns16550.h> |
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#include <asm/cpu.h> |
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#include <asm/io.h> |
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#include <linux/err.h> |
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#include <linux/types.h> |
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#ifndef CONFIG_X86 |
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/* |
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* Problem areas: |
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* - putc() uses the ns16550 address directly and assumed I/O access. Many |
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* platforms will use memory access |
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* get_codeseg32() is only meaningful on x86 |
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*/ |
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#error "This file needs to be ported for use on architectures" |
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#endif |
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static struct efi_priv *global_priv; |
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static bool use_uart; |
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struct __packed desctab_info { |
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uint16_t limit; |
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uint64_t addr; |
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uint16_t pad; |
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}; |
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/* |
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* EFI uses Unicode and we don't. The easiest way to get a sensible output |
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* function is to use the U-Boot debug UART. We use EFI's console output |
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* function where available, and assume the built-in UART after that. We rely |
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* on EFI to set up the UART for us and just bring in the functions here. |
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* This last bit is a bit icky, but it's only for debugging anyway. We could |
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* build in ns16550.c with some effort, but this is a payload loader after |
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* all. |
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* |
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* Note: We avoid using printf() so we don't need to bring in lib/vsprintf.c. |
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* That would require some refactoring since we already build this for U-Boot. |
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* Building an EFI shared library version would have to be a separate stem. |
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* That might push us to using the SPL framework to build this stub. However |
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* that would involve a round of EFI-specific changes in SPL. Worth |
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* considering if we start needing more U-Boot functionality. Note that we |
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* could then move get_codeseg32() to arch/x86/cpu/cpu.c. |
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*/ |
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void _debug_uart_init(void) |
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{ |
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} |
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void putc(const char ch) |
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{ |
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if (ch == '\n') |
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putc('\r'); |
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if (use_uart) { |
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NS16550_t com_port = (NS16550_t)0x3f8; |
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while ((inb((ulong)&com_port->lsr) & UART_LSR_THRE) == 0) |
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; |
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outb(ch, (ulong)&com_port->thr); |
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} else { |
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efi_putc(global_priv, ch); |
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} |
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} |
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void puts(const char *str) |
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{ |
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while (*str) |
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putc(*str++); |
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} |
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static void _debug_uart_putc(int ch) |
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{ |
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putc(ch); |
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} |
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DEBUG_UART_FUNCS |
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void *memcpy(void *dest, const void *src, size_t size) |
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{ |
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unsigned char *dptr = dest; |
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const unsigned char *ptr = src; |
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const unsigned char *end = src + size; |
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while (ptr < end) |
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*dptr++ = *ptr++; |
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return dest; |
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} |
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void *memset(void *inptr, int ch, size_t size) |
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{ |
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char *ptr = inptr; |
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char *end = ptr + size; |
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while (ptr < end) |
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*ptr++ = ch; |
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return ptr; |
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} |
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static void jump_to_uboot(ulong cs32, ulong addr, ulong info) |
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{ |
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#ifdef CONFIG_EFI_STUB_32BIT |
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/* |
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* U-Boot requires these parameters in registers, not on the stack. |
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* See _x86boot_start() for this code. |
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*/ |
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typedef void (*func_t)(int bist, int unused, ulong info) |
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__attribute__((regparm(3))); |
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((func_t)addr)(0, 0, info); |
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#else |
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cpu_call32(cs32, CONFIG_SYS_TEXT_BASE, info); |
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#endif |
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} |
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#ifdef CONFIG_EFI_STUB_64BIT |
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static void get_gdt(struct desctab_info *info) |
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{ |
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asm volatile ("sgdt %0" : : "m"(*info) : "memory"); |
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} |
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#endif |
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static inline unsigned long read_cr3(void) |
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{ |
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unsigned long val; |
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asm volatile("mov %%cr3,%0" : "=r" (val) : : "memory"); |
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return val; |
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} |
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/** |
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* get_codeseg32() - Find the code segment to use for 32-bit code |
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* |
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* U-Boot only works in 32-bit mode at present, so when booting from 64-bit |
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* EFI we must first change to 32-bit mode. To do this we need to find the |
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* correct code segment to use (an entry in the Global Descriptor Table). |
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* |
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* @return code segment GDT offset, or 0 for 32-bit EFI, -ENOENT if not found |
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*/ |
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static int get_codeseg32(void) |
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{ |
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int cs32 = 0; |
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#ifdef CONFIG_EFI_STUB_64BIT |
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struct desctab_info gdt; |
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uint64_t *ptr; |
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int i; |
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get_gdt(&gdt); |
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for (ptr = (uint64_t *)(unsigned long)gdt.addr, i = 0; i < gdt.limit; |
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i += 8, ptr++) { |
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uint64_t desc = *ptr; |
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uint64_t base, limit; |
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/* |
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* Check that the target U-Boot jump address is within the |
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* selector and that the selector is of the right type. |
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*/ |
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base = ((desc >> GDT_BASE_LOW_SHIFT) & GDT_BASE_LOW_MASK) | |
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((desc >> GDT_BASE_HIGH_SHIFT) & GDT_BASE_HIGH_MASK) |
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<< 16; |
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limit = ((desc >> GDT_LIMIT_LOW_SHIFT) & GDT_LIMIT_LOW_MASK) | |
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((desc >> GDT_LIMIT_HIGH_SHIFT) & GDT_LIMIT_HIGH_MASK) |
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<< 16; |
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base <<= 12; /* 4KB granularity */ |
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limit <<= 12; |
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if ((desc & GDT_PRESENT) && (desc & GDT_NOTSYS) && |
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!(desc & GDT_LONG) && (desc & GDT_4KB) && |
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(desc & GDT_32BIT) && (desc & GDT_CODE) && |
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CONFIG_SYS_TEXT_BASE > base && |
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CONFIG_SYS_TEXT_BASE + CONFIG_SYS_MONITOR_LEN < limit |
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) { |
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cs32 = i; |
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break; |
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} |
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} |
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#ifdef DEBUG |
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puts("\ngdt: "); |
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printhex8(gdt.limit); |
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puts(", addr: "); |
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printhex8(gdt.addr >> 32); |
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printhex8(gdt.addr); |
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for (i = 0; i < gdt.limit; i += 8) { |
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uint32_t *ptr = (uint32_t *)((unsigned long)gdt.addr + i); |
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puts("\n"); |
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printhex2(i); |
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puts(": "); |
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printhex8(ptr[1]); |
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puts(" "); |
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printhex8(ptr[0]); |
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} |
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puts("\n "); |
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puts("32-bit code segment: "); |
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printhex2(cs32); |
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puts("\n "); |
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puts("page_table: "); |
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printhex8(read_cr3()); |
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puts("\n "); |
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#endif |
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if (!cs32) { |
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puts("Can't find 32-bit code segment\n"); |
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return -ENOENT; |
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} |
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#endif |
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return cs32; |
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} |
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static int setup_info_table(struct efi_priv *priv, int size) |
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{ |
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struct efi_info_hdr *info; |
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efi_status_t ret; |
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/* Get some memory for our info table */ |
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priv->info_size = size; |
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info = efi_malloc(priv, priv->info_size, &ret); |
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if (ret) { |
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printhex2(ret); |
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puts(" No memory for info table: "); |
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return ret; |
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} |
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memset(info, '\0', sizeof(*info)); |
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info->version = EFI_TABLE_VERSION; |
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info->hdr_size = sizeof(*info); |
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priv->info = info; |
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priv->next_hdr = (char *)info + info->hdr_size; |
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return 0; |
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} |
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static void add_entry_addr(struct efi_priv *priv, enum efi_entry_t type, |
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void *ptr1, int size1, void *ptr2, int size2) |
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{ |
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struct efi_entry_hdr *hdr = priv->next_hdr; |
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hdr->type = type; |
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hdr->size = size1 + size2; |
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hdr->addr = 0; |
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hdr->link = ALIGN(sizeof(*hdr) + hdr->size, 16); |
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priv->next_hdr += hdr->link; |
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memcpy(hdr + 1, ptr1, size1); |
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memcpy((void *)(hdr + 1) + size1, ptr2, size2); |
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priv->info->total_size = (ulong)priv->next_hdr - (ulong)priv->info; |
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} |
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/** |
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* efi_main() - Start an EFI image |
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* |
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* This function is called by our EFI start-up code. It handles running |
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* U-Boot. If it returns, EFI will continue. |
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*/ |
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efi_status_t EFIAPI efi_main(efi_handle_t image, |
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struct efi_system_table *sys_table) |
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{ |
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struct efi_priv local_priv, *priv = &local_priv; |
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struct efi_boot_services *boot = sys_table->boottime; |
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struct efi_mem_desc *desc; |
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struct efi_entry_memmap map; |
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struct efi_gop *gop; |
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struct efi_entry_gopmode mode; |
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struct efi_entry_systable table; |
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efi_guid_t efi_gop_guid = EFI_GOP_GUID; |
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efi_uintn_t key, desc_size, size; |
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efi_status_t ret; |
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u32 version; |
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int cs32; |
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ret = efi_init(priv, "Payload", image, sys_table); |
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if (ret) { |
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printhex2(ret); |
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puts(" efi_init() failed\n"); |
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return ret; |
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} |
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global_priv = priv; |
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cs32 = get_codeseg32(); |
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if (cs32 < 0) |
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return EFI_UNSUPPORTED; |
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/* Get the memory map so we can switch off EFI */ |
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size = 0; |
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ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version); |
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if (ret != EFI_BUFFER_TOO_SMALL) { |
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printhex2(EFI_BITS_PER_LONG); |
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putc(' '); |
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printhex2(ret); |
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puts(" No memory map\n"); |
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return ret; |
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} |
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size += 1024; /* Since doing a malloc() may change the memory map! */ |
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desc = efi_malloc(priv, size, &ret); |
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if (!desc) { |
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printhex2(ret); |
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puts(" No memory for memory descriptor\n"); |
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return ret; |
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} |
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ret = setup_info_table(priv, size + 128); |
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if (ret) |
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return ret; |
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ret = boot->locate_protocol(&efi_gop_guid, NULL, (void **)&gop); |
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if (ret) { |
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puts(" GOP unavailable\n"); |
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} else { |
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mode.fb_base = gop->mode->fb_base; |
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mode.fb_size = gop->mode->fb_size; |
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mode.info_size = gop->mode->info_size; |
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add_entry_addr(priv, EFIET_GOP_MODE, &mode, sizeof(mode), |
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gop->mode->info, |
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sizeof(struct efi_gop_mode_info)); |
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} |
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ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version); |
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if (ret) { |
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printhex2(ret); |
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puts(" Can't get memory map\n"); |
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return ret; |
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} |
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table.sys_table = (ulong)sys_table; |
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add_entry_addr(priv, EFIET_SYS_TABLE, &table, sizeof(table), NULL, 0); |
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ret = boot->exit_boot_services(image, key); |
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if (ret) { |
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/* |
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* Unfortunately it happens that we cannot exit boot services |
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* the first time. But the second time it work. I don't know |
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* why but this seems to be a repeatable problem. To get |
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* around it, just try again. |
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*/ |
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printhex2(ret); |
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puts(" Can't exit boot services\n"); |
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size = sizeof(desc); |
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ret = boot->get_memory_map(&size, desc, &key, &desc_size, |
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&version); |
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if (ret) { |
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printhex2(ret); |
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puts(" Can't get memory map\n"); |
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return ret; |
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} |
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ret = boot->exit_boot_services(image, key); |
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if (ret) { |
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printhex2(ret); |
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puts(" Can't exit boot services 2\n"); |
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return ret; |
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} |
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} |
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/* The EFI UART won't work now, switch to a debug one */ |
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use_uart = true; |
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map.version = version; |
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map.desc_size = desc_size; |
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add_entry_addr(priv, EFIET_MEMORY_MAP, &map, sizeof(map), desc, size); |
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add_entry_addr(priv, EFIET_END, NULL, 0, 0, 0); |
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memcpy((void *)CONFIG_SYS_TEXT_BASE, _binary_u_boot_bin_start, |
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(ulong)_binary_u_boot_bin_end - |
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(ulong)_binary_u_boot_bin_start); |
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#ifdef DEBUG |
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puts("EFI table at "); |
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printhex8((ulong)priv->info); |
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puts(" size "); |
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printhex8(priv->info->total_size); |
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#endif |
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putc('\n'); |
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jump_to_uboot(cs32, CONFIG_SYS_TEXT_BASE, (ulong)priv->info); |
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return EFI_LOAD_ERROR; |
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}
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