| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Startup glue code to uncompress the kernel |
| 3 | * |
| 4 | * (C) 2017 Helge Deller <deller@gmx.de> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/linkage.h> |
| 9 | #include <asm/asm-offsets.h> |
| 10 | #include <asm/page.h> |
| 11 | #include <asm/psw.h> |
| 12 | #include <asm/pdc.h> |
| 13 | #include <asm/assembly.h> |
| 14 | #include "sizes.h" |
| 15 | |
| 16 | #define BOOTADDR(x) (x) |
| 17 | |
| 18 | #ifndef CONFIG_64BIT |
| 19 | .import $global$ /* forward declaration */ |
| 20 | #endif /*!CONFIG_64BIT*/ |
| 21 | |
| 22 | __HEAD |
| 23 | |
| 24 | ENTRY(startup) |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 25 | .level PA_ASM_LEVEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 26 | |
| 27 | #define PSW_W_SM 0x200 |
| 28 | #define PSW_W_BIT 36 |
| 29 | |
| 30 | ;! nuke the W bit, saving original value |
| 31 | .level 2.0 |
| 32 | rsm PSW_W_SM, %r1 |
| 33 | |
| 34 | .level 1.1 |
| 35 | extrw,u %r1, PSW_W_BIT-32, 1, %r1 |
| 36 | copy %r1, %arg0 |
| 37 | |
| 38 | /* Make sure sr4-sr7 are set to zero for the kernel address space */ |
| 39 | mtsp %r0,%sr4 |
| 40 | mtsp %r0,%sr5 |
| 41 | mtsp %r0,%sr6 |
| 42 | mtsp %r0,%sr7 |
| 43 | |
| 44 | /* Clear BSS */ |
| 45 | |
| 46 | .import _bss,data |
| 47 | .import _ebss,data |
| 48 | |
| 49 | load32 BOOTADDR(_bss),%r3 |
| 50 | load32 BOOTADDR(_ebss),%r4 |
| 51 | ldo FRAME_SIZE(%r4),%sp /* stack at end of bss */ |
| 52 | $bss_loop: |
| 53 | cmpb,<<,n %r3,%r4,$bss_loop |
| 54 | stw,ma %r0,4(%r3) |
| 55 | |
| 56 | /* Initialize the global data pointer */ |
| 57 | loadgp |
| 58 | |
| 59 | /* arg0..arg4 were set by palo. */ |
| 60 | copy %arg1, %r6 /* command line */ |
| 61 | copy %arg2, %r7 /* rd-start */ |
| 62 | copy %arg3, %r8 /* rd-end */ |
| 63 | load32 BOOTADDR(decompress_kernel),%r3 |
| 64 | |
| 65 | #ifdef CONFIG_64BIT |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 66 | .level PA_ASM_LEVEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 67 | ssm PSW_W_SM, %r0 /* set W-bit */ |
| 68 | depdi 0, 31, 32, %r3 |
| 69 | #endif |
| 70 | load32 BOOTADDR(startup_continue), %r2 |
| 71 | bv,n 0(%r3) |
| 72 | |
| 73 | startup_continue: |
| 74 | #ifdef CONFIG_64BIT |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 75 | .level PA_ASM_LEVEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 76 | rsm PSW_W_SM, %r0 /* clear W-bit */ |
| 77 | #endif |
| 78 | |
| 79 | load32 KERNEL_BINARY_TEXT_START, %arg0 /* free mem */ |
| 80 | copy %r6, %arg1 /* command line */ |
| 81 | copy %r7, %arg2 /* rd-start */ |
| 82 | copy %r8, %arg3 /* rd-end */ |
| 83 | |
| 84 | bv,n 0(%ret0) |
| 85 | END(startup) |