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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/nwfpe/fpa11.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/nwfpe/fpa11.c')
-rw-r--r-- | arch/arm/nwfpe/fpa11.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpa11.c b/arch/arm/nwfpe/fpa11.c new file mode 100644 index 000000000..2379e2cc7 --- /dev/null +++ b/arch/arm/nwfpe/fpa11.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + NetWinder Floating Point Emulator + (c) Rebel.COM, 1998,1999 + (c) Philip Blundell, 2001 + + Direct questions, comments to Scott Bambrough <scottb@netwinder.org> + +*/ + +#include "fpa11.h" +#include "fpopcode.h" + +#include "fpmodule.h" +#include "fpmodule.inl" + +#include <linux/compiler.h> +#include <linux/string.h> + +/* Reset the FPA11 chip. Called to initialize and reset the emulator. */ +static void resetFPA11(void) +{ + int i; + FPA11 *fpa11 = GET_FPA11(); + + /* initialize the register type array */ + for (i = 0; i <= 7; i++) { + fpa11->fType[i] = typeNone; + } + + /* FPSR: set system id to FP_EMULATOR, set AC, clear all other bits */ + fpa11->fpsr = FP_EMULATOR | BIT_AC; +} + +int8 SetRoundingMode(const unsigned int opcode) +{ + switch (opcode & MASK_ROUNDING_MODE) { + default: + case ROUND_TO_NEAREST: + return float_round_nearest_even; + + case ROUND_TO_PLUS_INFINITY: + return float_round_up; + + case ROUND_TO_MINUS_INFINITY: + return float_round_down; + + case ROUND_TO_ZERO: + return float_round_to_zero; + } +} + +int8 SetRoundingPrecision(const unsigned int opcode) +{ +#ifdef CONFIG_FPE_NWFPE_XP + switch (opcode & MASK_ROUNDING_PRECISION) { + case ROUND_SINGLE: + return 32; + + case ROUND_DOUBLE: + return 64; + + case ROUND_EXTENDED: + return 80; + + default: + return 80; + } +#endif + return 80; +} + +void nwfpe_init_fpa(union fp_state *fp) +{ + FPA11 *fpa11 = (FPA11 *)fp; +#ifdef NWFPE_DEBUG + printk("NWFPE: setting up state.\n"); +#endif + memset(fpa11, 0, sizeof(FPA11)); + resetFPA11(); + fpa11->initflag = 1; +} + +/* Emulate the instruction in the opcode. */ +unsigned int EmulateAll(unsigned int opcode) +{ + unsigned int code; + +#ifdef NWFPE_DEBUG + printk("NWFPE: emulating opcode %08x\n", opcode); +#endif + code = opcode & 0x00000f00; + if (code == 0x00000100 || code == 0x00000200) { + /* For coprocessor 1 or 2 (FPA11) */ + code = opcode & 0x0e000000; + if (code == 0x0e000000) { + if (opcode & 0x00000010) { + /* Emulate conversion opcodes. */ + /* Emulate register transfer opcodes. */ + /* Emulate comparison opcodes. */ + return EmulateCPRT(opcode); + } else { + /* Emulate monadic arithmetic opcodes. */ + /* Emulate dyadic arithmetic opcodes. */ + return EmulateCPDO(opcode); + } + } else if (code == 0x0c000000) { + /* Emulate load/store opcodes. */ + /* Emulate load/store multiple opcodes. */ + return EmulateCPDT(opcode); + } + } + + /* Invalid instruction detected. Return FALSE. */ + return 0; +} |