d01447b319
This implements a bit of rework for the PMB code, which permits us to kill off the legacy PMB mode completely. Rather than trusting the boot loader to do the right thing, we do a quick verification of the PMB contents to determine whether to have the kernel setup the initial mappings or whether it needs to mangle them later on instead. If we're booting from legacy mappings, the kernel will now take control of them and make them match the kernel's initial mapping configuration. This is accomplished by breaking the initialization phase out in to multiple steps: synchronization, merging, and resizing. With the recent rework, the synchronization code establishes page links for compound mappings already, so we build on top of this for promoting mappings and reclaiming unused slots. At the same time, the changes introduced for the uncached helpers also permit us to dynamically resize the uncached mapping without any particular headaches. The smallest page size is more than sufficient for mapping all of kernel text, and as we're careful not to jump to any far off locations in the setup code the mapping can safely be resized regardless of whether we are executing from it or not. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
/*
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* arch/sh/boot/compressed/misc.c
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*
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* Adapted for SH by Stuart Menefy, Aug 1999
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*
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* Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
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*/
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#include <asm/uaccess.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#define memzero(s, n) memset ((s), 0, (n))
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/* cache.c */
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#define CACHE_ENABLE 0
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#define CACHE_DISABLE 1
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int cache_control(unsigned int command);
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extern char input_data[];
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extern int input_len;
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static unsigned char *output;
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static void error(char *m);
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int puts(const char *);
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extern int _text; /* Defined in vmlinux.lds.S */
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extern int _end;
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define HEAP_SIZE 0x400000
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#else
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#define HEAP_SIZE 0x10000
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#endif
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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int puts(const char *s)
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{
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/* This should be updated to use the sh-sci routines */
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return 0;
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}
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void* memset(void* s, int c, size_t n)
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{
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int i;
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char *ss = (char*)s;
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for (i=0;i<n;i++) ss[i] = c;
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return s;
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}
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void* memcpy(void* __dest, __const void* __src,
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size_t __n)
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{
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int i;
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char *d = (char *)__dest, *s = (char *)__src;
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for (i=0;i<__n;i++) d[i] = s[i];
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return __dest;
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}
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static void error(char *x)
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{
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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while(1); /* Halt */
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}
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#ifdef CONFIG_SUPERH64
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#define stackalign 8
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#else
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#define stackalign 4
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#endif
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#define STACK_SIZE (4096)
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long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
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long *stack_start = &user_stack[STACK_SIZE];
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void decompress_kernel(void)
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{
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unsigned long output_addr;
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#ifdef CONFIG_SUPERH64
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output_addr = (CONFIG_MEMORY_START + 0x2000);
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#else
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output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
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#if defined(CONFIG_29BIT)
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output_addr |= P2SEG;
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#endif
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#endif
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output = (unsigned char *)output_addr;
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free_mem_ptr = (unsigned long)&_end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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puts("Uncompressing Linux... ");
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cache_control(CACHE_ENABLE);
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decompress(input_data, input_len, NULL, NULL, output, NULL, error);
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cache_control(CACHE_DISABLE);
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puts("Ok, booting the kernel.\n");
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}
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