root/arch/powerpc/boot/opal-calls.S

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