diff -ur linux-2.4.17-pre8/Documentation/i386/boot.txt linux-2.4.17-pre8-203/Documentation/i386/boot.txt --- linux-2.4.17-pre8/Documentation/i386/boot.txt Wed Nov 7 14:46:01 2001 +++ linux-2.4.17-pre8-203/Documentation/i386/boot.txt Tue Dec 11 14:22:33 2001 @@ -2,7 +2,7 @@ ---------------------------- H. Peter Anvin - Last update 2000-10-29 + Last update 2001-12-11 On the i386 platform, the Linux kernel uses a rather complicated boot convention. This has evolved partially due to historical aspects, as @@ -31,6 +31,9 @@ BIOS entry points. zImage deprecated but still supported. +Protocol 2.03: (???) Explicitly makes the highest possible initrd address + available to the bootloader. + **** MEMORY LAYOUT @@ -45,7 +48,7 @@ 098000 +------------------------+ | Kernel setup | The kernel real-mode code. 090200 +------------------------+ - | Kernel boot sector | The kernel legacy boot sector. + | Kernel boot sector | The kernel legacy boot sector. 090000 +------------------------+ | Protected-mode kernel | The bulk of the kernel image. 010000 +------------------------+ @@ -123,6 +126,7 @@ 0224/2 2.01+ heap_end_ptr Free memory after setup end 0226/2 N/A pad1 Unused 0228/4 2.02+ cmd_line_ptr 32-bit pointer to the kernel command line +022C/4 2.03+ initrd_addr_max Highest legal initrd address For backwards compatibility, if the setup_sects field contains 0, the real value is 4. @@ -181,8 +185,8 @@ The initrd should typically be located as high in memory as possible, as it may otherwise get overwritten by the early kernel initialization sequence. However, it must never be - located above address 0x3C000000 if you want all kernels to - read it. + located above the address specified in the initrd_addr_max + field. The initrd should be at least 4K page aligned. cmd_line_ptr: If the protocol version is 2.02 or higher, this is a 32-bit @@ -192,7 +196,15 @@ command line, in which case you can point this to an empty string (or better yet, to the string "auto".) If this field is left at zero, the kernel will assume that your boot loader - does not support the 2.02 protocol. + does not support the 2.02+ protocol. + + ramdisk_max: + The maximum address that may be occupied by the initrd + contents. For boot protocols 2.02 or earlier, this field is + not present, and the maximum address is 0x37FFFFFF. (This + address is defined as the address of the highest safe byte, so + if your ramdisk is exactly 131072 bytes long and this field is + 0x37FFFFFF, you can start your ramdisk at 0x37FE0000.) **** THE KERNEL COMMAND LINE @@ -254,14 +266,14 @@ if ( protocol >= 0x0202 ) { cmd_line_ptr = base_ptr + 0x9000; } else { - cmd_line_magic = 0xA33F; + cmd_line_magic = 0xA33F; cmd_line_offset = 0x9000; setup_move_size = 0x9100; } } else { /* Very old kernel */ - cmd_line_magic = 0xA33F; + cmd_line_magic = 0xA33F; cmd_line_offset = 0x9000; /* A very old kernel MUST have its real-mode code @@ -411,4 +423,3 @@ After completing your hook, you should jump to the address that was in this field before your boot loader overwrote it. - Only in linux-2.4.17-pre8-203/Documentation/i386: boot.txt~ diff -ur linux-2.4.17-pre8/arch/i386/boot/setup.S linux-2.4.17-pre8-203/arch/i386/boot/setup.S --- linux-2.4.17-pre8/arch/i386/boot/setup.S Fri Nov 9 13:58:02 2001 +++ linux-2.4.17-pre8-203/arch/i386/boot/setup.S Tue Dec 11 14:16:46 2001 @@ -50,7 +50,8 @@ #include #include #include - +#include + /* Signature words to ensure LILO loaded us right */ #define SIG1 0xAA55 #define SIG2 0x5A5A @@ -79,7 +80,7 @@ # This is the setup header, and it must start at %cs:2 (old 0x9020:2) .ascii "HdrS" # header signature - .word 0x0202 # header version number (>= 0x0105) + .word 0x0203 # header version number (>= 0x0105) # or else old loadlin-1.5 will fail) realmode_swtch: .word 0, 0 # default_switch, SETUPSEG start_sys_seg: .word SYSSEG @@ -152,6 +153,10 @@ # 0x90000 segment; the setup # can be located anywhere in # low memory 0x10000 or higher. + +ramdisk_max: .long __MAXMEM-1 # (Header version 0x0203 or later) + # The highest safe address for + # the contents of an initrd trampoline: call start_of_setup .space 1024 diff -ur linux-2.4.17-pre8/arch/i386/kernel/setup.c linux-2.4.17-pre8-203/arch/i386/kernel/setup.c --- linux-2.4.17-pre8/arch/i386/kernel/setup.c Tue Dec 11 14:19:34 2001 +++ linux-2.4.17-pre8-203/arch/i386/kernel/setup.c Tue Dec 11 14:16:46 2001 @@ -827,10 +827,8 @@ #define PFN_PHYS(x) ((x) << PAGE_SHIFT) /* - * 128MB for vmalloc and initrd + * Reserved space for vmalloc and iomap - defined in asm/page.h */ -#define VMALLOC_RESERVE (unsigned long)(128 << 20) -#define MAXMEM (unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE) #define MAXMEM_PFN PFN_DOWN(MAXMEM) #define MAX_NONPAE_PFN (1 << 20) diff -ur linux-2.4.17-pre8/include/asm-i386/page.h linux-2.4.17-pre8-203/include/asm-i386/page.h --- linux-2.4.17-pre8/include/asm-i386/page.h Thu Nov 22 11:46:18 2001 +++ linux-2.4.17-pre8-203/include/asm-i386/page.h Tue Dec 11 14:16:46 2001 @@ -80,6 +80,12 @@ #define __PAGE_OFFSET (0xC0000000) +/* + * This much address space is reserved for vmalloc() and iomap() + * as well as fixmap mappings. + */ +#define __VMALLOC_RESERVE (128 << 20) + #ifndef __ASSEMBLY__ /* @@ -118,6 +124,9 @@ #endif /* __ASSEMBLY__ */ #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) +#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE) +#define __MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE) +#define MAXMEM ((unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE)) #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))