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| /*
| * Startup glue code to uncompress the kernel
| *
| * (C) 2017 Helge Deller <deller@gmx.de>
| */
|
| #include <linux/init.h>
| #include <linux/linkage.h>
| #include <asm/asm-offsets.h>
| #include <asm/page.h>
| #include <asm/psw.h>
| #include <asm/pdc.h>
| #include <asm/assembly.h>
| #include "sizes.h"
|
| #define BOOTADDR(x) (x)
|
| #ifndef CONFIG_64BIT
| .import $global$ /* forward declaration */
| #endif /*!CONFIG_64BIT*/
|
| __HEAD
|
| ENTRY(startup)
| .level PA_ASM_LEVEL
|
| #define PSW_W_SM 0x200
| #define PSW_W_BIT 36
|
| ;! nuke the W bit, saving original value
| .level 2.0
| rsm PSW_W_SM, %r1
|
| .level 1.1
| extrw,u %r1, PSW_W_BIT-32, 1, %r1
| copy %r1, %arg0
|
| /* Make sure sr4-sr7 are set to zero for the kernel address space */
| mtsp %r0,%sr4
| mtsp %r0,%sr5
| mtsp %r0,%sr6
| mtsp %r0,%sr7
|
| /* Clear BSS */
|
| .import _bss,data
| .import _ebss,data
|
| load32 BOOTADDR(_bss),%r3
| load32 BOOTADDR(_ebss),%r4
| ldo FRAME_SIZE(%r4),%sp /* stack at end of bss */
| $bss_loop:
| cmpb,<<,n %r3,%r4,$bss_loop
| stw,ma %r0,4(%r3)
|
| /* Initialize the global data pointer */
| loadgp
|
| /* arg0..arg4 were set by palo. */
| copy %arg1, %r6 /* command line */
| copy %arg2, %r7 /* rd-start */
| copy %arg3, %r8 /* rd-end */
| load32 BOOTADDR(decompress_kernel),%r3
|
| #ifdef CONFIG_64BIT
| .level PA_ASM_LEVEL
| ssm PSW_W_SM, %r0 /* set W-bit */
| depdi 0, 31, 32, %r3
| #endif
| load32 BOOTADDR(startup_continue), %r2
| bv,n 0(%r3)
|
| startup_continue:
| #ifdef CONFIG_64BIT
| .level PA_ASM_LEVEL
| rsm PSW_W_SM, %r0 /* clear W-bit */
| #endif
|
| load32 KERNEL_BINARY_TEXT_START, %arg0 /* free mem */
| copy %r6, %arg1 /* command line */
| copy %r7, %arg2 /* rd-start */
| copy %r8, %arg3 /* rd-end */
|
| bv,n 0(%ret0)
| END(startup)
|
|
