86 lines
1.7 KiB
ArmAsm
86 lines
1.7 KiB
ArmAsm
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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 <deller@gmx.de>
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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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