| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Copyright (c) 2016 IBM Corporation. |
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| 4 | */ |
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| 5 | |
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| 6 | #include "ppc_asm.h" |
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| 7 | #include "../include/asm/opal-api.h" |
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| 8 | |
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| 9 | .text |
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| 10 | |
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| 11 | .globl opal_kentry |
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| 12 | opal_kentry: |
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| 13 | /* r3 is the fdt ptr */ |
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| 14 | mtctr r4 |
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| 15 | li r4, 0 |
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| 16 | li r5, 0 |
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| 17 | li r6, 0 |
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| 18 | li r7, 0 |
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| 19 | LOAD_REG_ADDR(r11, opal) |
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| 20 | ld r8,0(r11) |
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| 21 | ld r9,8(r11) |
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| 22 | bctr |
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| 23 | |
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| 24 | #define OPAL_CALL(name, token) \ |
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| 25 | .globl name; \ |
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| 26 | name: \ |
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| 27 | li r0, token; \ |
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| 28 | b opal_call; |
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| 29 | |
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| 30 | opal_call: |
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| 31 | mflr r11 |
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| 32 | std r11,16(r1) |
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| 33 | mfcr r12 |
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| 34 | stw r12,8(r1) |
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| 35 | mr r13,r2 |
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| 36 | |
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| 37 | /* Set opal return address */ |
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| 38 | LOAD_REG_ADDR(r11, opal_return) |
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| 39 | mtlr r11 |
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| 40 | mfmsr r12 |
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| 41 | |
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| 42 | /* switch to BE when we enter OPAL */ |
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| 43 | li r11,MSR_LE |
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| 44 | andc r12,r12,r11 |
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| 45 | mtspr SPRN_HSRR1,r12 |
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| 46 | |
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| 47 | /* load the opal call entry point and base */ |
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| 48 | LOAD_REG_ADDR(r11, opal) |
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| 49 | ld r12,8(r11) |
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| 50 | ld r2,0(r11) |
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| 51 | mtspr SPRN_HSRR0,r12 |
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| 52 | hrfid |
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| 53 | |
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| 54 | opal_return: |
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| 55 | FIXUP_ENDIAN |
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| 56 | mr r2,r13; |
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| 57 | lwz r11,8(r1); |
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| 58 | ld r12,16(r1) |
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| 59 | mtcr r11; |
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| 60 | mtlr r12 |
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| 61 | blr |
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| 62 | |
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| 63 | OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE); |
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| 64 | OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ); |
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| 65 | OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE); |
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| 66 | OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS); |
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| 67 | OPAL_CALL(opal_console_flush, OPAL_CONSOLE_FLUSH); |
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| 68 | |
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