source: mainline/kernel/arch/sparc64/src/trap/sun4v/mmu.S@ eaf4c393

#
# Copyright (c) 2006 Jakub Jermar
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/**
 * @file
 * @brief       MMU trap handlers that do not fit into the trap table.
 */

.register %g2, #scratch
.register %g3, #scratch

.text

#include <arch/trap/sun4v/mmu.h>
#include <arch/trap/trap_table.h>
#include <arch/sun4v/regdef.h>

/*
 * Install mapping for the kernel. The mapping obeys this formula:
 *      virtual address = real address + start of physical memory
 *
 * The routine expects the following values of registers:
 *       %g1    virtual address that has caused the miss
 */
.global install_identity_mapping
install_identity_mapping:

        /* output registers mustn't be clobbered during the hypercall, SAVE is too risky */
        mov %o0, %g3
        mov %o1, %g4
        mov %o2, %g5
        mov %o3, %g6

        /* install mapping for kernel */
        mov %g1, %o0
        set 0, %o1                                      ! set context
        setx kernel_8k_tlb_data_template, %g1, %g2      ! g2 <= template of TTE Data
        ldx [%g2], %g2                                  ! read the TTE Data template
        add %g2, %o0, %o2                               ! template + VA = TTE Data entry
        set MMU_FLAG_DTLB, %o3                          ! map in DTLB only
        ta MMU_MAP_ADDR

        /* restore output registers */
        mov %g6, %o3
        mov %g5, %o2
        mov %g4, %o1
        mov %g3, %o0

        retry