diff options
Diffstat (limited to 'qemu/roms/openbios/arch/sparc32/wof.S')
| -rw-r--r-- | qemu/roms/openbios/arch/sparc32/wof.S | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/qemu/roms/openbios/arch/sparc32/wof.S b/qemu/roms/openbios/arch/sparc32/wof.S deleted file mode 100644 index 8d6bb7314..000000000 --- a/qemu/roms/openbios/arch/sparc32/wof.S +++ /dev/null @@ -1,133 +0,0 @@ -/* - * Proll takes this from Sparclinux kernel, ruthlessly truncated - * because we have no user windows. - * - * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, - * MA 02110-1301, USA. - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License V2 - * as published by the Free Software Foundation - */ - -// #include <asm/winmacro.h> -// #include <asm/asmmacro.h> - -/* Reg_window offsets */ -#define RW_L0 0x00 -#define RW_L1 0x04 -#define RW_L2 0x08 -#define RW_L3 0x0c -#define RW_L4 0x10 -#define RW_L5 0x14 -#define RW_L6 0x18 -#define RW_L7 0x1c -#define RW_I0 0x20 -#define RW_I1 0x24 -#define RW_I2 0x28 -#define RW_I3 0x2c -#define RW_I4 0x30 -#define RW_I5 0x34 -#define RW_I6 0x38 -#define RW_I7 0x3c - -/* Store the register window onto the 8-byte aligned area starting - * at %reg. It might be %sp, it might not, we don't care. - */ -#define STORE_WINDOW(reg) \ - std %l0, [%reg + RW_L0]; \ - std %l2, [%reg + RW_L2]; \ - std %l4, [%reg + RW_L4]; \ - std %l6, [%reg + RW_L6]; \ - std %i0, [%reg + RW_I0]; \ - std %i2, [%reg + RW_I2]; \ - std %i4, [%reg + RW_I4]; \ - std %i6, [%reg + RW_I6]; - -/* We define macro's for registers which have a fixed - * meaning throughout this entire routine. The 'T' in - * the comments mean that the register can only be - * accessed when in the 'trap' window, 'G' means - * accessible in any window. Do not change these registers - * after they have been set, until you are ready to return - * from the trap. - */ -#define t_psr l0 /* %psr at trap time T */ -#define t_pc l1 /* PC for trap return T */ -#define t_npc l2 /* NPC for trap return T */ -#define t_wim l3 /* %wim at trap time T */ -#define saved_g5 l5 /* Global save register T */ -#define saved_g6 l6 /* Global save register T */ - -/* Now registers whose values can change within the handler. */ -#define twin_tmp l4 /* Temp reg, only usable in trap window T */ -#define glob_tmp g5 /* Global temporary reg, usable anywhere G */ - - .text - .align 4 - - /* BEGINNING OF PATCH INSTRUCTIONS */ - /* On a 7-window Sparc the boot code patches spnwin_* - * instructions with the following ones. - */ - .globl spnwin_patch1_7win, spnwin_patch2_7win, spnwin_patch3_7win -spnwin_patch1_7win: sll %t_wim, 6, %glob_tmp -spnwin_patch2_7win: and %glob_tmp, 0x7f, %glob_tmp -spnwin_patch3_7win: and %twin_tmp, 0x7f, %twin_tmp - /* END OF PATCH INSTRUCTIONS */ - - /* The trap entry point has done the following: - * - * rd %psr, %l0 - * rd %wim, %l3 - * b spill_window_entry - * nop - */ - - .globl spill_window_entry - .globl spnwin_patch1, spnwin_patch2 -spill_window_entry: - /* LOCATION: Trap Window */ - - mov %g5, %saved_g5 ! save away global temp register - mov %g6, %saved_g6 ! save away 'current' ptr register - - /* Compute what the new %wim will be if we save the - * window properly in this trap handler. - * - * newwim = ((%wim>>1) | (%wim<<(nwindows - 1))); - */ - srl %t_wim, 0x1, %twin_tmp -spnwin_patch1: sll %t_wim, 7, %glob_tmp - or %glob_tmp, %twin_tmp, %glob_tmp -spnwin_patch2: and %glob_tmp, 0xff, %glob_tmp - - /* Save into the window which must be saved and do it. - */ - save %g0, %g0, %g0 ! save into the window to stash away - wr %glob_tmp, 0x0, %wim ! set new %wim, this is safe now - - /* LOCATION: Window to be saved */ - - STORE_WINDOW(sp) ! stash the window - restore %g0, %g0, %g0 ! go back into trap window - - /* LOCATION: Trap window */ - mov %saved_g5, %g5 ! restore %glob_tmp - mov %saved_g6, %g6 ! restore %curptr - wr %t_psr, 0x0, %psr ! restore condition codes in %psr - nop; nop; nop ! waste some time - jmp %t_pc ! Return from trap - rett %t_npc ! we are done |