73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ke/i686/krnlinit.c
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* DESCRIPTION: CPU architecture specific kernel initialization
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Performs architecture-specific initialization for the kernel executive.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KepArchInitialize(VOID)
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{
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/* Clear EFLAGS register */
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ArWriteEflagsRegister(0);
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/* Enable write-protection */
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ArWriteControlRegister(0, ArReadControlRegister(0) | CR0_WP);
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/* Re-enable IDE interrupts */
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HlIoPortOutByte(0x376, 0);
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HlIoPortOutByte(0x3F6, 0);
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}
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/**
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* This routine starts up the XT kernel. It is called after switching boot stack.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KepStartKernel(VOID)
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{
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LdrPrint(L"Hello from new kernel stack!\n");
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for(;;);
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}
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/**
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* Switches to a new kernel boot stack.
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*
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* @return This routine does not return any value
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KepSwitchBootStack(IN ULONG_PTR Stack)
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{
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/* Discard old stack frame, switch stack, make space for NPX and jump to KepStartKernel() */
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asm volatile("mov %0, %%edx\n"
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"xor %%ebp, %%ebp\n"
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"mov %%edx, %%esp\n"
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"sub %1, %%esp\n"
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"push %2\n"
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"jmp _KepStartKernel@0\n"
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:
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: "m" (Stack),
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"i" (KTRAP_FRAME_ALIGN | KTRAP_FRAME_SIZE | NPX_FRAME_SIZE),
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"i" (CR0_EM | CR0_MP | CR0_TS),
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"p" (KepStartKernel));
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}
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