| /* |
| * 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) |
