6a01ac2504
The x86 thread code is all x86_32 specific. It needs to be updated to work with 64 bit. For now just throw an error when compiling. BUG=b:179699789 TEST=none Suggested-by: Furquan Shaikh <furquan@google.com> Signed-off-by: Raul E Rangel <rrangel@chromium.org> Change-Id: I96187ad84bdec40c6883748afa41e217bc389b79 Reviewed-on: https://review.coreboot.org/c/coreboot/+/56571 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <thread.h>
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#if ENV_X86_64
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#error COOP_MULTITASKING does not currently support x86_64
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#endif
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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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