mirror of https://github.com/ipxe/ipxe.git
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* librm: a library for interfacing to real-mode code
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*
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* Michael Brown <mbrown@fensystems.co.uk>
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <realmode.h>
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/*
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* This file provides functions for managing librm.
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*
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*/
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/**
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* Allocate space on the real-mode stack and copy data there from a
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* user buffer
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*
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* @v data User buffer
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* @v size Size of stack data
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* @ret sp New value of real-mode stack pointer
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*/
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uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size ) {
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userptr_t rm_stack;
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rm_sp -= size;
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rm_stack = real_to_user ( rm_ss, rm_sp );
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memcpy_user ( rm_stack, 0, data, 0, size );
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return rm_sp;
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};
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/**
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* Deallocate space on the real-mode stack, optionally copying back
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* data to a user buffer.
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*
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* @v data User buffer
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* @v size Size of stack data
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*/
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void remove_user_from_rm_stack ( userptr_t data, size_t size ) {
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if ( data ) {
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userptr_t rm_stack = real_to_user ( rm_ss, rm_sp );
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memcpy_user ( rm_stack, 0, data, 0, size );
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}
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rm_sp += size;
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};
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PROVIDE_UACCESS_INLINE ( librm, phys_to_user );
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PROVIDE_UACCESS_INLINE ( librm, user_to_phys );
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PROVIDE_UACCESS_INLINE ( librm, virt_to_user );
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PROVIDE_UACCESS_INLINE ( librm, user_to_virt );
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PROVIDE_UACCESS_INLINE ( librm, userptr_add );
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PROVIDE_UACCESS_INLINE ( librm, memcpy_user );
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PROVIDE_UACCESS_INLINE ( librm, memmove_user );
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PROVIDE_UACCESS_INLINE ( librm, memset_user );
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PROVIDE_UACCESS_INLINE ( librm, strlen_user );
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PROVIDE_UACCESS_INLINE ( librm, memchr_user );
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