2 * PMU register read/write functions for TCG IBM POWER chips
4 * Copyright IBM Corp. 2021
7 * Daniel Henrique Barboza <danielhb413@gmail.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
13 #if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
16 * Checks whether the Group A SPR (MMCR0, MMCR2, MMCRA, and the
17 * PMCs) has problem state read access.
19 * Read acccess is granted for all PMCC values but 0b01, where a
20 * Facility Unavailable Interrupt will occur.
22 static bool spr_groupA_read_allowed(DisasContext *ctx)
24 if (!ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
25 gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
33 * Checks whether the Group A SPR (MMCR0, MMCR2, MMCRA, and the
34 * PMCs) has problem state write access.
36 * Write acccess is granted for PMCC values 0b10 and 0b11. Userspace
37 * writing with PMCC 0b00 will generate a Hypervisor Emulation
38 * Assistance Interrupt. Userspace writing with PMCC 0b01 will
39 * generate a Facility Unavailable Interrupt.
41 static bool spr_groupA_write_allowed(DisasContext *ctx)
43 if (ctx->mmcr0_pmcc0) {
47 if (ctx->mmcr0_pmcc1) {
49 gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
52 gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_REG);
59 * Helper function to avoid code repetition between MMCR0 and
60 * MMCR2 problem state write functions.
62 static TCGv masked_gprn_for_spr_write(int gprn, int sprn,
65 TCGv ret = tcg_temp_new();
66 TCGv t0 = tcg_temp_new();
68 /* 'ret' starts with all mask bits cleared */
69 gen_load_spr(ret, sprn);
70 tcg_gen_andi_tl(ret, ret, ~(spr_mask));
72 /* Apply the mask into 'gprn' in a temp var */
73 tcg_gen_andi_tl(t0, cpu_gpr[gprn], spr_mask);
75 /* Add the masked gprn bits into 'ret' */
76 tcg_gen_or_tl(ret, ret, t0);
81 void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
85 if (!spr_groupA_read_allowed(ctx)) {
92 * Filter out all bits but FC, PMAO, and PMAE, according
93 * to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
96 gen_load_spr(t0, SPR_POWER_MMCR0);
97 tcg_gen_andi_tl(t0, t0, MMCR0_UREG_MASK);
98 tcg_gen_mov_tl(cpu_gpr[gprn], t0);
101 static void write_MMCR0_common(DisasContext *ctx, TCGv val)
104 * helper_store_mmcr0 will make clock based operations that
105 * will cause 'bad icount read' errors if we do not execute
106 * gen_icount_io_start() beforehand.
108 gen_icount_io_start(ctx);
109 gen_helper_store_mmcr0(cpu_env, val);
112 * End the translation block because MMCR0 writes can change
115 ctx->base.is_jmp = DISAS_EXIT_UPDATE;
118 void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
122 if (!spr_groupA_write_allowed(ctx)) {
127 * Filter out all bits but FC, PMAO, and PMAE, according
128 * to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
131 masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR0,
133 write_MMCR0_common(ctx, masked_gprn);
136 void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
140 if (!spr_groupA_read_allowed(ctx)) {
147 * On read, filter out all bits that are not FCnP0 bits.
148 * When MMCR0[PMCC] is set to 0b10 or 0b11, providing
149 * problem state programs read/write access to MMCR2,
150 * only the FCnP0 bits can be accessed. All other bits are
151 * not changed when mtspr is executed in problem state, and
152 * all other bits return 0s when mfspr is executed in problem
153 * state, according to ISA v3.1, section 10.4.6 Monitor Mode
154 * Control Register 2, p. 1316, third paragraph.
156 gen_load_spr(t0, SPR_POWER_MMCR2);
157 tcg_gen_andi_tl(t0, t0, MMCR2_UREG_MASK);
158 tcg_gen_mov_tl(cpu_gpr[gprn], t0);
161 void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
165 if (!spr_groupA_write_allowed(ctx)) {
170 * Filter the bits that can be written using MMCR2_UREG_MASK,
171 * similar to what is done in spr_write_MMCR0_ureg().
173 masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR2,
175 gen_store_spr(SPR_POWER_MMCR2, masked_gprn);
178 void spr_read_PMC(DisasContext *ctx, int gprn, int sprn)
180 TCGv_i32 t_sprn = tcg_constant_i32(sprn);
182 gen_icount_io_start(ctx);
183 gen_helper_read_pmc(cpu_gpr[gprn], cpu_env, t_sprn);
186 void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
188 if (!spr_groupA_read_allowed(ctx)) {
192 spr_read_PMC(ctx, gprn, sprn + 0x10);
195 void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
198 * If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
199 * Monitor, and a read attempt results in a Facility Unavailable
202 if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
203 gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
207 /* The remaining steps are similar to PMCs 1-4 userspace read */
208 spr_read_PMC14_ureg(ctx, gprn, sprn);
211 void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
213 TCGv_i32 t_sprn = tcg_constant_i32(sprn);
215 gen_icount_io_start(ctx);
216 gen_helper_store_pmc(cpu_env, t_sprn, cpu_gpr[gprn]);
219 void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
221 if (!spr_groupA_write_allowed(ctx)) {
225 spr_write_PMC(ctx, sprn + 0x10, gprn);
228 void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
231 * If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
232 * Monitor, and a write attempt results in a Facility Unavailable
235 if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
236 gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
240 /* The remaining steps are similar to PMCs 1-4 userspace write */
241 spr_write_PMC14_ureg(ctx, sprn, gprn);
244 void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
246 write_MMCR0_common(ctx, cpu_gpr[gprn]);
249 void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
251 gen_icount_io_start(ctx);
252 gen_helper_store_mmcr1(cpu_env, cpu_gpr[gprn]);
255 void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
257 spr_read_ureg(ctx, gprn, sprn);
260 void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
262 spr_noaccess(ctx, gprn, sprn);
265 void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
267 spr_read_ureg(ctx, gprn, sprn);
270 void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
272 spr_noaccess(ctx, gprn, sprn);
275 void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
277 spr_read_ureg(ctx, gprn, sprn);
280 void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
282 spr_read_ureg(ctx, gprn, sprn);
285 void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
287 spr_noaccess(ctx, gprn, sprn);
290 void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
292 spr_noaccess(ctx, gprn, sprn);
295 void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
297 spr_write_generic(ctx, sprn, gprn);
300 void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
302 spr_write_generic(ctx, sprn, gprn);
305 void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
307 spr_write_generic(ctx, sprn, gprn);
309 #endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */