/* SPDX-License-Identifier: GPL-2.0 */
#include <asm/ppc_asm.h>
#include <asm/asm-compat.h>

/* unsigned long xmon_mfspr(sprn, default_value) */
_GLOBAL(xmon_mfspr)
        LOAD_REG_ADDR(r5, .Lmfspr_table)
        b       xmon_mxspr

/* void xmon_mtspr(sprn, new_value) */
_GLOBAL(xmon_mtspr)
        LOAD_REG_ADDR(r5, .Lmtspr_table)
        b       xmon_mxspr

/*
 * r3 = sprn
 * r4 = default or new value
 * r5 = table base
 */
xmon_mxspr:
        /*
         * To index into the table of mxsprs we need:
         *  i = (sprn & 0x3ff) * 8
         * or using rwlinm:
         *  i = (sprn << 3) & (0x3ff << 3)
         */
        rlwinm  r3, r3, 3, 0x3ff << 3
        add     r5, r5, r3
        mtctr   r5
        mr      r3, r4 /* put default_value in r3 for mfspr */
        bctr

.Lmfspr_table:
        spr = 0
        .rept   1024
        mfspr   r3, spr
        blr
        spr = spr + 1
        .endr

.Lmtspr_table:
        spr = 0
        .rept   1024
        mtspr   spr, r4
        blr
        spr = spr + 1
        .endr