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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/parisc/boot/compressed/head.S
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/*

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 * Startup glue code to uncompress the kernel

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 *

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 *   (C) 2017 Helge Deller <[email protected]>

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 */

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#include <linux/init.h>

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#include <linux/linkage.h>

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#include <asm/asm-offsets.h>

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#include <asm/page.h>

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#include <asm/psw.h>

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#include <asm/pdc.h>

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#include <asm/assembly.h>

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#include "sizes.h"

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#define BOOTADDR(x)	(x)

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#ifndef CONFIG_64BIT

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	.import	$global$		/* forward declaration */

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#endif /*!CONFIG_64BIT*/

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	__HEAD

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ENTRY(startup)

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	 .level PA_ASM_LEVEL

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#define PSW_W_SM	0x200

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#define PSW_W_BIT       36

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	;! nuke the W bit, saving original value

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	.level 2.0

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	rsm	PSW_W_SM, %r1

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	.level 1.1

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	extrw,u	%r1, PSW_W_BIT-32, 1, %r1

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	copy	%r1, %arg0

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	/* Make sure sr4-sr7 are set to zero for the kernel address space */

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	mtsp    %r0,%sr4

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	mtsp    %r0,%sr5

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	mtsp    %r0,%sr6

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	mtsp    %r0,%sr7

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	/* Clear BSS */

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	.import _bss,data

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	.import _ebss,data

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	load32	BOOTADDR(_bss),%r3

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	load32	BOOTADDR(_ebss),%r4

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	ldo	FRAME_SIZE(%r4),%sp	/* stack at end of bss */

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$bss_loop:

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	cmpb,<<,n %r3,%r4,$bss_loop

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	stw,ma	%r0,4(%r3)

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	/* Initialize the global data pointer */

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	loadgp

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	/* arg0..arg4 were set by palo. */

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	copy	%arg1, %r6		/* command line */

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	copy	%arg2, %r7		/* rd-start */

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	copy	%arg3, %r8		/* rd-end */

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	load32	BOOTADDR(decompress_kernel),%r3

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#ifdef CONFIG_64BIT

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	.level PA_ASM_LEVEL

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	ssm	PSW_W_SM, %r0		/* set W-bit */

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	depdi	0, 31, 32, %r3

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#endif

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	load32	BOOTADDR(startup_continue), %r2

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	bv,n	0(%r3)

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startup_continue:

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#ifdef CONFIG_64BIT

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	.level PA_ASM_LEVEL

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	rsm	PSW_W_SM, %r0		/* clear W-bit */

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#endif

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	load32	KERNEL_BINARY_TEXT_START, %arg0 /* free mem */

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	copy	%r6, %arg1		/* command line */

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	copy	%r7, %arg2		/* rd-start */

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	copy	%r8, %arg3		/* rd-end */

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	bv,n	0(%ret0)

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END(startup)

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