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6825645a21
The first component that gets control after IPL is the zIPL-provided stage 3 boot loader. This boot loader is based on a binary image linked into the zIPL executable. When preparing a disk for IPL, zIPL updates runtime parameters in the boot loader image and writes the resulting data to disk. To support the Secure Boot firmware feature, the stage 3 code must be signed, and can therefore no longer contain variable parameter portions. Also the boot loader image should be accessible as a separate file to enable the use of external programs for creating the signature. This patch moves the stage 3 boot loader code to an external file location and splits out the parameter portion into a separate, unsigned on-disk component. The new memory layout of the stage 3 loader during its execution looks as follows: * 0x0000-0x1fff Lowcore * 0x2000-0x5fff Memory allocation (heap) * 0x7000-0x8fff free * 0x9000-0x9fff Stage3 parameter * 0xa000-0xcfff Stage3 code * 0xd000-0xefff Section: bss, rodata, data * 0xf000-0xffff Stack Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
58 lines
996 B
Plaintext
58 lines
996 B
Plaintext
/*
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* Memory layout for stage 3
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* =========================
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*
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* General memory layout
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* ---------------------
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*
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* 0x0000-0x1fff Lowcore
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* 0x2000-0x5fff Memory allocation (heap)
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* 0x6000-0x8fff free
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* 0x9000-0x9fff Stage3 parameter
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* 0xa000-0xdfff Stage3 code + data
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* 0xe000-0xffff Stack
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*/
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SECTIONS
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{
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. = 0x0;
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. = 0x2000;
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__heap_start = .;
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. = 0x6000;
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__heap_stop = .;
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/* stage 3 parameter */
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. = 0x9000;
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_parm_addr = .;
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. = 0x9008;
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_initrd_addr = .;
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. = 0x9010;
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_initrd_len = .;
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. = 0x9018;
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_load_psw = .;
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. = 0x9020;
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_extra_parm = .;
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. = 0x9028;
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stage3_flags =.;
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. = 0x9030;
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_image_len = .;
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. = 0x9038;
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_image_addr = .;
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. = 0xa000;
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.text.start : { *(.text.start) }
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.text : { *(.text) }
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__ex_table_start = .;
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.ex_table : { *(.ex_table) }
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__ex_table_stop = .;
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.eh_frame : { *(.eh_frame) }
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__bss_start = .;
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.bss : { *(.bss) }
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__bss_stop = .;
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.rodata : {*(.rodata) }
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.data : { *(.data) }
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}
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