| 1 | /* |
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| 2 | * Startup glue code to uncompress the kernel |
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| 3 | * |
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| 4 | * (C) 2017 Helge Deller <deller@gmx.de> |
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| 5 | */ |
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| 6 | |
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| 7 | #include <linux/init.h> |
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| 8 | #include <linux/linkage.h> |
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| 9 | #include <asm/asm-offsets.h> |
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| 10 | #include <asm/page.h> |
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| 11 | #include <asm/psw.h> |
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| 12 | #include <asm/pdc.h> |
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| 13 | #include <asm/assembly.h> |
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| 14 | #include "sizes.h" |
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| 15 | |
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| 16 | #define BOOTADDR(x) (x) |
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| 17 | |
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| 18 | #ifndef CONFIG_64BIT |
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| 19 | .import $global$ /* forward declaration */ |
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| 20 | #endif /*!CONFIG_64BIT*/ |
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| 21 | |
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| 22 | __HEAD |
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| 23 | |
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| 24 | ENTRY(startup) |
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| 25 | .level PA_ASM_LEVEL |
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| 26 | |
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| 27 | #define PSW_W_SM 0x200 |
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| 28 | #define PSW_W_BIT 36 |
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| 29 | |
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| 30 | ;! nuke the W bit, saving original value |
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| 31 | .level 2.0 |
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| 32 | rsm PSW_W_SM, %r1 |
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| 33 | |
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| 34 | .level 1.1 |
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| 35 | extrw,u %r1, PSW_W_BIT-32, 1, %r1 |
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| 36 | copy %r1, %arg0 |
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| 37 | |
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| 38 | /* Make sure sr4-sr7 are set to zero for the kernel address space */ |
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| 39 | mtsp %r0,%sr4 |
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| 40 | mtsp %r0,%sr5 |
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| 41 | mtsp %r0,%sr6 |
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| 42 | mtsp %r0,%sr7 |
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| 43 | |
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| 44 | /* Clear BSS */ |
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| 45 | |
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| 46 | .import _bss,data |
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| 47 | .import _ebss,data |
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| 48 | |
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| 49 | load32 BOOTADDR(_bss),%r3 |
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| 50 | load32 BOOTADDR(_ebss),%r4 |
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| 51 | ldo FRAME_SIZE(%r4),%sp /* stack at end of bss */ |
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| 52 | $bss_loop: |
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| 53 | cmpb,<<,n %r3,%r4,$bss_loop |
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| 54 | stw,ma %r0,4(%r3) |
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| 55 | |
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| 56 | /* Initialize the global data pointer */ |
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| 57 | loadgp |
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| 58 | |
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| 59 | /* arg0..arg4 were set by palo. */ |
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| 60 | copy %arg1, %r6 /* command line */ |
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| 61 | copy %arg2, %r7 /* rd-start */ |
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| 62 | copy %arg3, %r8 /* rd-end */ |
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| 63 | load32 BOOTADDR(decompress_kernel),%r3 |
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| 64 | |
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| 65 | #ifdef CONFIG_64BIT |
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| 66 | .level PA_ASM_LEVEL |
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| 67 | ssm PSW_W_SM, %r0 /* set W-bit */ |
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| 68 | depdi 0, 31, 32, %r3 |
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| 69 | #endif |
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| 70 | load32 BOOTADDR(startup_continue), %r2 |
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| 71 | bv,n 0(%r3) |
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| 72 | |
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| 73 | startup_continue: |
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| 74 | #ifdef CONFIG_64BIT |
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| 75 | .level PA_ASM_LEVEL |
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| 76 | rsm PSW_W_SM, %r0 /* clear W-bit */ |
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| 77 | #endif |
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| 78 | |
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| 79 | load32 KERNEL_BINARY_TEXT_START, %arg0 /* free mem */ |
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| 80 | copy %r6, %arg1 /* command line */ |
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| 81 | copy %r7, %arg2 /* rd-start */ |
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| 82 | copy %r8, %arg3 /* rd-end */ |
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| 83 | |
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| 84 | bv,n 0(%ret0) |
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| 85 | END(startup) |
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| 86 | |
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