diff options
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/boot.h | 18 | ||||
| -rw-r--r-- | arch/x86/boot/cmdline.c | 12 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/cmdline.c | 12 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 48 | ||||
| -rw-r--r-- | arch/x86/boot/header.S | 10 |
5 files changed, 67 insertions, 33 deletions
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 18997e5a1053..5b7531966b84 100644 --- a/arch/x86/boot/boot.h +++ b/arch/x86/boot/boot.h @@ -285,16 +285,26 @@ struct biosregs { void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); /* cmdline.c */ -int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize); -int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option); +int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); +int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) { - return __cmdline_find_option(boot_params.hdr.cmd_line_ptr, option, buffer, bufsize); + unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; + + if (cmd_line_ptr >= 0x100000) + return -1; /* inaccessible */ + + return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); } static inline int cmdline_find_option_bool(const char *option) { - return __cmdline_find_option_bool(boot_params.hdr.cmd_line_ptr, option); + unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; + + if (cmd_line_ptr >= 0x100000) + return -1; /* inaccessible */ + + return __cmdline_find_option_bool(cmd_line_ptr, option); } diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c index 6b3b6f708c04..625d21b0cd3f 100644 --- a/arch/x86/boot/cmdline.c +++ b/arch/x86/boot/cmdline.c @@ -27,7 +27,7 @@ static inline int myisspace(u8 c) * Returns the length of the argument (regardless of if it was * truncated to fit in the buffer), or -1 on not found. */ -int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize) +int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize) { addr_t cptr; char c; @@ -41,8 +41,8 @@ int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int st_bufcpy /* Copying this to buffer */ } state = st_wordstart; - if (!cmdline_ptr || cmdline_ptr >= 0x100000) - return -1; /* No command line, or inaccessible */ + if (!cmdline_ptr) + return -1; /* No command line */ cptr = cmdline_ptr & 0xf; set_fs(cmdline_ptr >> 4); @@ -99,7 +99,7 @@ int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int * Returns the position of that option (starts counting with 1) * or 0 on not found */ -int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option) +int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option) { addr_t cptr; char c; @@ -111,8 +111,8 @@ int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option) st_wordskip, /* Miscompare, skip */ } state = st_wordstart; - if (!cmdline_ptr || cmdline_ptr >= 0x100000) - return -1; /* No command line, or inaccessible */ + if (!cmdline_ptr) + return -1; /* No command line */ cptr = cmdline_ptr & 0xf; set_fs(cmdline_ptr >> 4); diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c index 10f6b1178c68..bffd73b45b1f 100644 --- a/arch/x86/boot/compressed/cmdline.c +++ b/arch/x86/boot/compressed/cmdline.c @@ -13,13 +13,21 @@ static inline char rdfs8(addr_t addr) return *((char *)(fs + addr)); } #include "../cmdline.c" +static unsigned long get_cmd_line_ptr(void) +{ + unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr; + + cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32; + + return cmd_line_ptr; +} int cmdline_find_option(const char *option, char *buffer, int bufsize) { - return __cmdline_find_option(real_mode->hdr.cmd_line_ptr, option, buffer, bufsize); + return __cmdline_find_option(get_cmd_line_ptr(), option, buffer, bufsize); } int cmdline_find_option_bool(const char *option) { - return __cmdline_find_option_bool(real_mode->hdr.cmd_line_ptr, option); + return __cmdline_find_option_bool(get_cmd_line_ptr(), option); } #endif diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index f5d1aaa0dec8..c1d383d1fb7e 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -37,6 +37,12 @@ __HEAD .code32 ENTRY(startup_32) + /* + * 32bit entry is 0 and it is ABI so immutable! + * If we come here directly from a bootloader, + * kernel(text+data+bss+brk) ramdisk, zero_page, command line + * all need to be under the 4G limit. + */ cld /* * Test KEEP_SEGMENTS flag to see if the bootloader is asking @@ -154,6 +160,12 @@ ENTRY(startup_32) btsl $_EFER_LME, %eax wrmsr + /* After gdt is loaded */ + xorl %eax, %eax + lldt %ax + movl $0x20, %eax + ltr %ax + /* * Setup for the jump to 64bit mode * @@ -176,28 +188,18 @@ ENTRY(startup_32) lret ENDPROC(startup_32) -no_longmode: - /* This isn't an x86-64 CPU so hang */ -1: - hlt - jmp 1b - -#include "../../kernel/verify_cpu.S" - - /* - * Be careful here startup_64 needs to be at a predictable - * address so I can export it in an ELF header. Bootloaders - * should look at the ELF header to find this address, as - * it may change in the future. - */ .code64 .org 0x200 ENTRY(startup_64) /* + * 64bit entry is 0x200 and it is ABI so immutable! * We come here either from startup_32 or directly from a - * 64bit bootloader. If we come here from a bootloader we depend on - * an identity mapped page table being provied that maps our - * entire text+data+bss and hopefully all of memory. + * 64bit bootloader. + * If we come here from a bootloader, kernel(text+data+bss+brk), + * ramdisk, zero_page, command line could be above 4G. + * We depend on an identity mapped page table being provided + * that maps our entire kernel(text+data+bss+brk), zero page + * and command line. */ #ifdef CONFIG_EFI_STUB /* @@ -247,9 +249,6 @@ preferred_addr: movl %eax, %ss movl %eax, %fs movl %eax, %gs - lldt %ax - movl $0x20, %eax - ltr %ax /* * Compute the decompressed kernel start address. It is where @@ -349,6 +348,15 @@ relocated: */ jmp *%rbp + .code32 +no_longmode: + /* This isn't an x86-64 CPU so hang */ +1: + hlt + jmp 1b + +#include "../../kernel/verify_cpu.S" + .data gdt: .word gdt_end - gdt diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index 944ce595f767..9ec06a1f6d61 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -374,6 +374,14 @@ xloadflags: #else # define XLF0 0 #endif + +#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_X86_64) + /* kernel/boot_param/ramdisk could be loaded above 4g */ +# define XLF1 XLF_CAN_BE_LOADED_ABOVE_4G +#else +# define XLF1 0 +#endif + #ifdef CONFIG_EFI_STUB # ifdef CONFIG_X86_64 # define XLF23 XLF_EFI_HANDOVER_64 /* 64-bit EFI handover ok */ @@ -383,7 +391,7 @@ xloadflags: #else # define XLF23 0 #endif - .word XLF0 | XLF23 + .word XLF0 | XLF1 | XLF23 cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line, #added with boot protocol |
