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Fix bugs between Filter.addvalue and ckt32 macro call: [re-]compressed

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Linux kernels were not booting.  Explain .addvalue better.
Set kernel stack pointer for boot-time decompression according to
Linux kernel documentation.
	     p_vmlinx.cpp      p_vmlinz.cpp
	stub/l_vmlinx.asm stub/l_vmlinz.asm
	filter/cto.h filter/ctoj.h filter/ctok.h

committer: jreiser <jreiser> 1103326936 +0000
This commit is contained in:
John Reiser
2004-12-17 23:42:16 +00:00
parent b24fb59c94
commit 1418f57b96
7 changed files with 58 additions and 18 deletions
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src/p_vmlinx.cpp
+16 -3
View File
@@ -217,7 +217,7 @@ void PackVmlinuxI386::pack(OutputFile *fo)
ph.filter = 0;
Filter ft(ph.level);
ft.buf_len = ph.u_len;
ft.addvalue = 0;
ft.addvalue = 0; // we are independent of actual runtime address; see ckt32
compressWithFilters(&ft, 1 << 20);
@@ -243,6 +243,10 @@ void PackVmlinuxI386::pack(OutputFile *fo)
fo->write(obuf, ph.c_len); fo_off += ph.c_len;
fo->write(loader, lsize); fo_off += lsize;
#if 0
printf("%-13s: compressed : %8u bytes\n", getName(), ph.c_len);
printf("%-13s: decompressor : %8u bytes\n", getName(), lsize);
#endif
verifyOverlappingDecompression();
// .note with 1st page --------------------------------
@@ -490,8 +494,17 @@ void PackVmlinuxI386::unpack(OutputFile *fo)
// cli # but if it matters, then there is a race!
//
// movl $ __BOOT_DS,%eax
// movl %eax,%ss; movl $0x99000,%esp # 2.6.7 setup had ss:sp of 9000:8ffe
// /* Avoid EBDA (Extended BIOS Data Area) below 0xA0000. */
// movl %eax,%ss; leal 0x9000(%esi),%esp # 0x99000 typical
// /* Linux Documentation/i386/boot.txt "SAMPLE BOOT CONFIGURATION" says
// 0x8000-0x8FFF Stack and heap [inside the "real mode segment",
// just below the command line at offset 0x9000].
//
// arch/i386/boot/compressed/head.S "Do the decompression ..." says
// %esi contains the "real mode pointer" [as a 32-bit addr].
//
// In any case, avoid EBDA (Extended BIOS Data Area) below 0xA0000.
// boot.txt says 0x9A000 is the limit. LILO goes up to 0x9B000.
// */
//
// pushl $0; popf # subsumes "cli; cld"; also clears NT for buggy BIOS
//