diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/parisc/boot/compressed/head.S | |
| parent | Initial commit. (diff) | |
| download | linux-upstream.tar.xz linux-upstream.zip | |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/parisc/boot/compressed/head.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/parisc/boot/compressed/head.S b/arch/parisc/boot/compressed/head.S new file mode 100644 index 000000000..e8b798fd0 --- /dev/null +++ b/arch/parisc/boot/compressed/head.S @@ -0,0 +1,85 @@ +/* + * 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) |