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21b9b14b49
Add a function to get the stack pointer and another to halt the CPU. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
53 lines
921 B
C
53 lines
921 B
C
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_PROCESSOR_H_
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#define __ASM_PROCESSOR_H_ 1
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#define X86_GDT_ENTRY_SIZE 8
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#ifndef __ASSEMBLY__
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enum {
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X86_GDT_ENTRY_NULL = 0,
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X86_GDT_ENTRY_UNUSED,
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X86_GDT_ENTRY_32BIT_CS,
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X86_GDT_ENTRY_32BIT_DS,
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X86_GDT_ENTRY_32BIT_FS,
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X86_GDT_ENTRY_16BIT_CS,
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X86_GDT_ENTRY_16BIT_DS,
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X86_GDT_NUM_ENTRIES
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};
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#else
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/* NOTE: If the above enum is modified, this define must be checked */
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#define X86_GDT_ENTRY_32BIT_DS 3
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#define X86_GDT_NUM_ENTRIES 7
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#endif
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#define X86_GDT_SIZE (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)
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#ifndef __ASSEMBLY__
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static inline __attribute__((always_inline)) void cpu_hlt(void)
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{
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asm("hlt");
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}
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static inline ulong cpu_get_sp(void)
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{
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ulong result;
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asm volatile(
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"mov %%esp, %%eax"
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: "=a" (result));
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return result;
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}
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#endif /* __ASSEMBLY__ */
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#endif
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