20bbd81201
As discussed on the mailing list and voted upon, the coreboot project is going to move the majority of copyrights out of the headers and into an AUTHORS file. This will happen a bit at a time, as we'll be unifying license headers at the same time. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: Ifd4329905847d9dd06de67b9a443c8ee50c0e7a7 Reviewed-on: https://review.coreboot.org/c/coreboot/+/35177 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <thread.h>
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/* The stack frame looks like the following after a pushad instruction. */
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struct pushad_regs {
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uint32_t edi; /* Offset 0x00 */
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uint32_t esi; /* Offset 0x04 */
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uint32_t ebp; /* Offset 0x08 */
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uint32_t esp; /* Offset 0x0c */
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uint32_t ebx; /* Offset 0x10 */
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uint32_t edx; /* Offset 0x14 */
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uint32_t ecx; /* Offset 0x18 */
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uint32_t eax; /* Offset 0x1c */
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};
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static inline uintptr_t push_stack(uintptr_t cur_stack, uintptr_t value)
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{
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uintptr_t *addr;
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cur_stack -= sizeof(value);
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addr = (uintptr_t *)cur_stack;
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*addr = value;
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return cur_stack;
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}
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void arch_prepare_thread(struct thread *t,
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asmlinkage void (*thread_entry)(void *), void *arg)
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{
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uintptr_t stack = t->stack_current;
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/* Imitate thread_entry(t) with return address of 0. thread_entry()
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* is assumed to never return. */
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stack = push_stack(stack, (uintptr_t)arg);
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stack = push_stack(stack, (uintptr_t)0);
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stack = push_stack(stack, (uintptr_t)thread_entry);
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/* Make room for the registers. Ignore initial values. */
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stack -= sizeof(struct pushad_regs);
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t->stack_current = stack;
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}
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void *arch_get_thread_stackbase(void)
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{
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/* defined in c_start.S */
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extern u8 thread_stacks[];
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return &thread_stacks[0];
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}
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