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_hvpriv_exception(ctx, POWERPC_EXCP_FU);
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_hvpriv_exception(ctx, POWERPC_EXCP_FU);
52 gen_hvpriv_exception(ctx, POWERPC_EXCP_INVAL_SPR);
59 * Helper function to avoid code repetition between MMCR0 and
60 * MMCR2 problem state write functions.
62 * 'ret' must be tcg_temp_freed() by the caller.
64 static TCGv masked_gprn_for_spr_write(int gprn, int sprn,
67 TCGv ret = tcg_temp_new();
68 TCGv t0 = tcg_temp_new();
70 /* 'ret' starts with all mask bits cleared */
71 gen_load_spr(ret, sprn);
72 tcg_gen_andi_tl(ret, ret, ~(spr_mask));
74 /* Apply the mask into 'gprn' in a temp var */
75 tcg_gen_andi_tl(t0, cpu_gpr[gprn], spr_mask);
77 /* Add the masked gprn bits into 'ret' */
78 tcg_gen_or_tl(ret, ret, t0);
85 void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
89 if (!spr_groupA_read_allowed(ctx)) {
96 * Filter out all bits but FC, PMAO, and PMAE, according
97 * to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
100 gen_load_spr(t0, SPR_POWER_MMCR0);
101 tcg_gen_andi_tl(t0, t0, MMCR0_UREG_MASK);
102 tcg_gen_mov_tl(cpu_gpr[gprn], t0);
107 static void write_MMCR0_common(DisasContext *ctx, TCGv val)
110 * helper_store_mmcr0 will make clock based operations that
111 * will cause 'bad icount read' errors if we do not execute
112 * gen_icount_io_start() beforehand.
114 gen_icount_io_start(ctx);
115 gen_helper_store_mmcr0(cpu_env, val);
118 * End the translation block because MMCR0 writes can change
121 ctx->base.is_jmp = DISAS_EXIT_UPDATE;
124 void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
128 if (!spr_groupA_write_allowed(ctx)) {
133 * Filter out all bits but FC, PMAO, and PMAE, according
134 * to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
137 masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR0,
139 write_MMCR0_common(ctx, masked_gprn);
141 tcg_temp_free(masked_gprn);
144 void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
148 if (!spr_groupA_read_allowed(ctx)) {
155 * On read, filter out all bits that are not FCnP0 bits.
156 * When MMCR0[PMCC] is set to 0b10 or 0b11, providing
157 * problem state programs read/write access to MMCR2,
158 * only the FCnP0 bits can be accessed. All other bits are
159 * not changed when mtspr is executed in problem state, and
160 * all other bits return 0s when mfspr is executed in problem
161 * state, according to ISA v3.1, section 10.4.6 Monitor Mode
162 * Control Register 2, p. 1316, third paragraph.
164 gen_load_spr(t0, SPR_POWER_MMCR2);
165 tcg_gen_andi_tl(t0, t0, MMCR2_UREG_MASK);
166 tcg_gen_mov_tl(cpu_gpr[gprn], t0);
171 void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
175 if (!spr_groupA_write_allowed(ctx)) {
180 * Filter the bits that can be written using MMCR2_UREG_MASK,
181 * similar to what is done in spr_write_MMCR0_ureg().
183 masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR2,
185 gen_store_spr(SPR_POWER_MMCR2, masked_gprn);
187 tcg_temp_free(masked_gprn);
190 void spr_read_PMC(DisasContext *ctx, int gprn, int sprn)
192 TCGv_i32 t_sprn = tcg_const_i32(sprn);
194 gen_icount_io_start(ctx);
195 gen_helper_read_pmc(cpu_gpr[gprn], cpu_env, t_sprn);
197 tcg_temp_free_i32(t_sprn);
200 void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
202 if (!spr_groupA_read_allowed(ctx)) {
206 spr_read_PMC(ctx, gprn, sprn + 0x10);
209 void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
212 * If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
213 * Monitor, and a read attempt results in a Facility Unavailable
216 if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
217 gen_hvpriv_exception(ctx, POWERPC_EXCP_FU);
221 /* The remaining steps are similar to PMCs 1-4 userspace read */
222 spr_read_PMC14_ureg(ctx, gprn, sprn);
225 void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
227 TCGv_i32 t_sprn = tcg_const_i32(sprn);
229 gen_icount_io_start(ctx);
230 gen_helper_store_pmc(cpu_env, t_sprn, cpu_gpr[gprn]);
232 tcg_temp_free_i32(t_sprn);
235 void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
237 if (!spr_groupA_write_allowed(ctx)) {
241 spr_write_PMC(ctx, sprn + 0x10, gprn);
244 void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
247 * If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
248 * Monitor, and a write attempt results in a Facility Unavailable
251 if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
252 gen_hvpriv_exception(ctx, POWERPC_EXCP_FU);
256 /* The remaining steps are similar to PMCs 1-4 userspace write */
257 spr_write_PMC14_ureg(ctx, sprn, gprn);
260 void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
262 write_MMCR0_common(ctx, cpu_gpr[gprn]);
265 void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
267 gen_icount_io_start(ctx);
268 gen_helper_store_mmcr1(cpu_env, cpu_gpr[gprn]);
271 void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
273 spr_read_ureg(ctx, gprn, sprn);
276 void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
278 spr_noaccess(ctx, gprn, sprn);
281 void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
283 spr_read_ureg(ctx, gprn, sprn);
286 void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
288 spr_noaccess(ctx, gprn, sprn);
291 void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
293 spr_read_ureg(ctx, gprn, sprn);
296 void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
298 spr_read_ureg(ctx, gprn, sprn);
301 void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
303 spr_noaccess(ctx, gprn, sprn);
306 void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
308 spr_noaccess(ctx, gprn, sprn);
311 void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
313 spr_write_generic(ctx, sprn, gprn);
316 void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
318 spr_write_generic(ctx, sprn, gprn);
321 void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
323 spr_write_generic(ctx, sprn, gprn);
325 #endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */