4 * Copyright (C) 2010-2016 Nathan Whitehorn
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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32 #include <sys/syscall.h>
34 #include <machine/trap.h>
35 #include <machine/param.h>
36 #include <machine/spr.h>
37 #include <machine/asm.h>
43 /* Glue for linker script */
45 .set kernbase, KERNBASE
58 #define TMPSTKSZ 16384 /* 16K temporary stack */
69 * Main kernel entry point.
72 * r3: Flattened Device Tree pointer (or zero)
74 * r5: OF client interface pointer (or zero)
75 * r6: Loader metadata pointer (or zero)
78 ASENTRY_NOPROF(__start)
79 /* Set up the TOC pointer */
84 .llong __tocbase + 0x8000 - .
90 ld %r31,-0x8000(%r2) /* First TOC entry is TOC base */
91 subf %r31,%r31,%r2 /* Subtract from real TOC base to get base */
93 /* Set up the stack pointer */
94 ld %r1,TOC_REF(tmpstk)(%r2)
95 addi %r1,%r1,TMPSTKSZ-96
117 mr %r4,%r2 /* Replace ignored r4 with tocbase for trap handlers */
121 /* Set stack pointer to new value and branch to mi_startup */
131 #include <powerpc/aim/trap_subr64.S>