2 * ARM GICv3 emulation: Redistributor
4 * Copyright (c) 2015 Huawei.
5 * Copyright (c) 2016 Linaro Limited.
6 * Written by Shlomo Pongratz, Peter Maydell
8 * This code is licensed under the GPL, version 2 or (at your option)
12 #include "qemu/osdep.h"
15 #include "gicv3_internal.h"
17 static uint32_t mask_group(GICv3CPUState *cs, MemTxAttrs attrs)
19 /* Return a 32-bit mask which should be applied for this set of 32
20 * interrupts; each bit is 1 if access is permitted by the
21 * combination of attrs.secure and GICR_GROUPR. (GICR_NSACR does
22 * not affect config register accesses, unlike GICD_NSACR.)
24 if (!attrs.secure && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
25 /* bits for Group 0 or Secure Group 1 interrupts are RAZ/WI */
26 return cs->gicr_igroupr0;
31 static int gicr_ns_access(GICv3CPUState *cs, int irq)
33 /* Return the 2 bit NSACR.NS_access field for this SGI */
35 return extract32(cs->gicr_nsacr, irq * 2, 2);
38 static void gicr_write_set_bitmap_reg(GICv3CPUState *cs, MemTxAttrs attrs,
39 uint32_t *reg, uint32_t val)
41 /* Helper routine to implement writing to a "set-bitmap" register */
42 val &= mask_group(cs, attrs);
44 gicv3_redist_update(cs);
47 static void gicr_write_clear_bitmap_reg(GICv3CPUState *cs, MemTxAttrs attrs,
48 uint32_t *reg, uint32_t val)
50 /* Helper routine to implement writing to a "clear-bitmap" register */
51 val &= mask_group(cs, attrs);
53 gicv3_redist_update(cs);
56 static uint32_t gicr_read_bitmap_reg(GICv3CPUState *cs, MemTxAttrs attrs,
59 reg &= mask_group(cs, attrs);
63 static uint8_t gicr_read_ipriorityr(GICv3CPUState *cs, MemTxAttrs attrs,
66 /* Read the value of GICR_IPRIORITYR<n> for the specified interrupt,
67 * honouring security state (these are RAZ/WI for Group 0 or Secure
68 * Group 1 interrupts).
72 prio = cs->gicr_ipriorityr[irq];
74 if (!attrs.secure && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
75 if (!(cs->gicr_igroupr0 & (1U << irq))) {
76 /* Fields for Group 0 or Secure Group 1 interrupts are RAZ/WI */
79 /* NS view of the interrupt priority */
80 prio = (prio << 1) & 0xff;
85 static void gicr_write_ipriorityr(GICv3CPUState *cs, MemTxAttrs attrs, int irq,
88 /* Write the value of GICD_IPRIORITYR<n> for the specified interrupt,
89 * honouring security state (these are RAZ/WI for Group 0 or Secure
90 * Group 1 interrupts).
92 if (!attrs.secure && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
93 if (!(cs->gicr_igroupr0 & (1U << irq))) {
94 /* Fields for Group 0 or Secure Group 1 interrupts are RAZ/WI */
97 /* NS view of the interrupt priority */
98 value = 0x80 | (value >> 1);
100 cs->gicr_ipriorityr[irq] = value;
103 static MemTxResult gicr_readb(GICv3CPUState *cs, hwaddr offset,
104 uint64_t *data, MemTxAttrs attrs)
107 case GICR_IPRIORITYR ... GICR_IPRIORITYR + 0x1f:
108 *data = gicr_read_ipriorityr(cs, attrs, offset - GICR_IPRIORITYR);
115 static MemTxResult gicr_writeb(GICv3CPUState *cs, hwaddr offset,
116 uint64_t value, MemTxAttrs attrs)
119 case GICR_IPRIORITYR ... GICR_IPRIORITYR + 0x1f:
120 gicr_write_ipriorityr(cs, attrs, offset - GICR_IPRIORITYR, value);
121 gicv3_redist_update(cs);
128 static MemTxResult gicr_readl(GICv3CPUState *cs, hwaddr offset,
129 uint64_t *data, MemTxAttrs attrs)
133 *data = cs->gicr_ctlr;
136 *data = gicv3_iidr();
139 *data = extract64(cs->gicr_typer, 0, 32);
142 *data = extract64(cs->gicr_typer, 32, 32);
145 /* RAZ/WI for us (this is an optional register and our implementation
146 * does not track RO/WO/reserved violations to report them to the guest)
151 *data = cs->gicr_waker;
154 *data = extract64(cs->gicr_propbaser, 0, 32);
156 case GICR_PROPBASER + 4:
157 *data = extract64(cs->gicr_propbaser, 32, 32);
160 *data = extract64(cs->gicr_pendbaser, 0, 32);
162 case GICR_PENDBASER + 4:
163 *data = extract64(cs->gicr_pendbaser, 32, 32);
166 if (!attrs.secure && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
170 *data = cs->gicr_igroupr0;
172 case GICR_ISENABLER0:
173 case GICR_ICENABLER0:
174 *data = gicr_read_bitmap_reg(cs, attrs, cs->gicr_ienabler0);
179 /* The pending register reads as the logical OR of the pending
180 * latch and the input line level for level-triggered interrupts.
182 uint32_t val = cs->gicr_ipendr0 | (~cs->edge_trigger & cs->level);
183 *data = gicr_read_bitmap_reg(cs, attrs, val);
186 case GICR_ISACTIVER0:
187 case GICR_ICACTIVER0:
188 *data = gicr_read_bitmap_reg(cs, attrs, cs->gicr_iactiver0);
190 case GICR_IPRIORITYR ... GICR_IPRIORITYR + 0x1f:
192 int i, irq = offset - GICR_IPRIORITYR;
195 for (i = irq + 3; i >= irq; i--, value <<= 8) {
196 value |= gicr_read_ipriorityr(cs, attrs, i);
204 /* Our edge_trigger bitmap is one bit per irq; take the correct
205 * half of it, and spread it out into the odd bits.
209 value = cs->edge_trigger & mask_group(cs, attrs);
210 value = extract32(value, (offset == GICR_ICFGR1) ? 16 : 0, 16);
211 value = half_shuffle32(value) << 1;
216 if ((cs->gic->gicd_ctlr & GICD_CTLR_DS) || !attrs.secure) {
217 /* RAZ/WI if security disabled, or if
218 * security enabled and this is an NS access
223 *data = cs->gicr_igrpmodr0;
226 if ((cs->gic->gicd_ctlr & GICD_CTLR_DS) || !attrs.secure) {
227 /* RAZ/WI if security disabled, or if
228 * security enabled and this is an NS access
233 *data = cs->gicr_nsacr;
235 case GICR_IDREGS ... GICR_IDREGS + 0x1f:
236 *data = gicv3_idreg(offset - GICR_IDREGS);
243 static MemTxResult gicr_writel(GICv3CPUState *cs, hwaddr offset,
244 uint64_t value, MemTxAttrs attrs)
248 /* For our implementation, GICR_TYPER.DPGS is 0 and so all
249 * the DPG bits are RAZ/WI. We don't do anything asynchronously,
250 * so UWP and RWP are RAZ/WI. And GICR_TYPER.LPIS is 0 (we don't
251 * implement LPIs) so Enable_LPIs is RES0. So there are no writable
256 /* RAZ/WI for our implementation */
259 /* Only the ProcessorSleep bit is writeable. When the guest sets
260 * it it requests that we transition the channel between the
261 * redistributor and the cpu interface to quiescent, and that
262 * we set the ChildrenAsleep bit once the inteface has reached the
264 * Setting the ProcessorSleep to 0 reverses the quiescing, and
265 * ChildrenAsleep is cleared once the transition is complete.
266 * Since our interface is not asynchronous, we complete these
267 * transitions instantaneously, so we set ChildrenAsleep to the
268 * same value as ProcessorSleep here.
270 value &= GICR_WAKER_ProcessorSleep;
271 if (value & GICR_WAKER_ProcessorSleep) {
272 value |= GICR_WAKER_ChildrenAsleep;
274 cs->gicr_waker = value;
277 cs->gicr_propbaser = deposit64(cs->gicr_propbaser, 0, 32, value);
279 case GICR_PROPBASER + 4:
280 cs->gicr_propbaser = deposit64(cs->gicr_propbaser, 32, 32, value);
283 cs->gicr_pendbaser = deposit64(cs->gicr_pendbaser, 0, 32, value);
285 case GICR_PENDBASER + 4:
286 cs->gicr_pendbaser = deposit64(cs->gicr_pendbaser, 32, 32, value);
289 if (!attrs.secure && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
292 cs->gicr_igroupr0 = value;
293 gicv3_redist_update(cs);
295 case GICR_ISENABLER0:
296 gicr_write_set_bitmap_reg(cs, attrs, &cs->gicr_ienabler0, value);
298 case GICR_ICENABLER0:
299 gicr_write_clear_bitmap_reg(cs, attrs, &cs->gicr_ienabler0, value);
302 gicr_write_set_bitmap_reg(cs, attrs, &cs->gicr_ipendr0, value);
305 gicr_write_clear_bitmap_reg(cs, attrs, &cs->gicr_ipendr0, value);
307 case GICR_ISACTIVER0:
308 gicr_write_set_bitmap_reg(cs, attrs, &cs->gicr_iactiver0, value);
310 case GICR_ICACTIVER0:
311 gicr_write_clear_bitmap_reg(cs, attrs, &cs->gicr_iactiver0, value);
313 case GICR_IPRIORITYR ... GICR_IPRIORITYR + 0x1f:
315 int i, irq = offset - GICR_IPRIORITYR;
317 for (i = irq; i < irq + 4; i++, value >>= 8) {
318 gicr_write_ipriorityr(cs, attrs, i, value);
320 gicv3_redist_update(cs);
324 /* Register is all RAZ/WI or RAO/WI bits */
330 /* Since our edge_trigger bitmap is one bit per irq, our input
331 * 32-bits will compress down into 16 bits which we need
332 * to write into the bitmap.
334 value = half_unshuffle32(value >> 1) << 16;
335 mask = mask_group(cs, attrs) & 0xffff0000U;
337 cs->edge_trigger &= ~mask;
338 cs->edge_trigger |= (value & mask);
340 gicv3_redist_update(cs);
344 if ((cs->gic->gicd_ctlr & GICD_CTLR_DS) || !attrs.secure) {
345 /* RAZ/WI if security disabled, or if
346 * security enabled and this is an NS access
350 cs->gicr_igrpmodr0 = value;
351 gicv3_redist_update(cs);
354 if ((cs->gic->gicd_ctlr & GICD_CTLR_DS) || !attrs.secure) {
355 /* RAZ/WI if security disabled, or if
356 * security enabled and this is an NS access
360 cs->gicr_nsacr = value;
361 /* no update required as this only affects access permission checks */
365 case GICR_IDREGS ... GICR_IDREGS + 0x1f:
366 /* RO registers, ignore the write */
367 qemu_log_mask(LOG_GUEST_ERROR,
368 "%s: invalid guest write to RO register at offset "
369 TARGET_FMT_plx "\n", __func__, offset);
376 static MemTxResult gicr_readll(GICv3CPUState *cs, hwaddr offset,
377 uint64_t *data, MemTxAttrs attrs)
381 *data = cs->gicr_typer;
384 *data = cs->gicr_propbaser;
387 *data = cs->gicr_pendbaser;
394 static MemTxResult gicr_writell(GICv3CPUState *cs, hwaddr offset,
395 uint64_t value, MemTxAttrs attrs)
399 cs->gicr_propbaser = value;
402 cs->gicr_pendbaser = value;
405 /* RO register, ignore the write */
406 qemu_log_mask(LOG_GUEST_ERROR,
407 "%s: invalid guest write to RO register at offset "
408 TARGET_FMT_plx "\n", __func__, offset);
415 MemTxResult gicv3_redist_read(void *opaque, hwaddr offset, uint64_t *data,
416 unsigned size, MemTxAttrs attrs)
418 GICv3State *s = opaque;
423 assert((offset & (size - 1)) == 0);
425 /* This region covers all the redistributor pages; there are
426 * (for GICv3) two 64K pages per CPU. At the moment they are
427 * all contiguous (ie in this one region), though we might later
428 * want to allow splitting of redistributor pages into several
429 * blocks so we can support more CPUs.
431 cpuidx = offset / 0x20000;
433 assert(cpuidx < s->num_cpu);
435 cs = &s->cpu[cpuidx];
439 r = gicr_readb(cs, offset, data, attrs);
442 r = gicr_readl(cs, offset, data, attrs);
445 r = gicr_readll(cs, offset, data, attrs);
452 if (r == MEMTX_ERROR) {
453 qemu_log_mask(LOG_GUEST_ERROR,
454 "%s: invalid guest read at offset " TARGET_FMT_plx
455 "size %u\n", __func__, offset, size);
456 trace_gicv3_redist_badread(gicv3_redist_affid(cs), offset,
458 /* The spec requires that reserved registers are RAZ/WI;
459 * so use MEMTX_ERROR returns from leaf functions as a way to
460 * trigger the guest-error logging but don't return it to
461 * the caller, or we'll cause a spurious guest data abort.
466 trace_gicv3_redist_read(gicv3_redist_affid(cs), offset, *data,
472 MemTxResult gicv3_redist_write(void *opaque, hwaddr offset, uint64_t data,
473 unsigned size, MemTxAttrs attrs)
475 GICv3State *s = opaque;
480 assert((offset & (size - 1)) == 0);
482 /* This region covers all the redistributor pages; there are
483 * (for GICv3) two 64K pages per CPU. At the moment they are
484 * all contiguous (ie in this one region), though we might later
485 * want to allow splitting of redistributor pages into several
486 * blocks so we can support more CPUs.
488 cpuidx = offset / 0x20000;
490 assert(cpuidx < s->num_cpu);
492 cs = &s->cpu[cpuidx];
496 r = gicr_writeb(cs, offset, data, attrs);
499 r = gicr_writel(cs, offset, data, attrs);
502 r = gicr_writell(cs, offset, data, attrs);
509 if (r == MEMTX_ERROR) {
510 qemu_log_mask(LOG_GUEST_ERROR,
511 "%s: invalid guest write at offset " TARGET_FMT_plx
512 "size %u\n", __func__, offset, size);
513 trace_gicv3_redist_badwrite(gicv3_redist_affid(cs), offset, data,
515 /* The spec requires that reserved registers are RAZ/WI;
516 * so use MEMTX_ERROR returns from leaf functions as a way to
517 * trigger the guest-error logging but don't return it to
518 * the caller, or we'll cause a spurious guest data abort.
522 trace_gicv3_redist_write(gicv3_redist_affid(cs), offset, data,
528 void gicv3_redist_set_irq(GICv3CPUState *cs, int irq, int level)
530 /* Update redistributor state for a change in an external PPI input line */
531 if (level == extract32(cs->level, irq, 1)) {
535 trace_gicv3_redist_set_irq(gicv3_redist_affid(cs), irq, level);
537 cs->level = deposit32(cs->level, irq, 1, level);
540 /* 0->1 edges latch the pending bit for edge-triggered interrupts */
541 if (extract32(cs->edge_trigger, irq, 1)) {
542 cs->gicr_ipendr0 = deposit32(cs->gicr_ipendr0, irq, 1, 1);
546 gicv3_redist_update(cs);
549 void gicv3_redist_send_sgi(GICv3CPUState *cs, int grp, int irq, bool ns)
551 /* Update redistributor state for a generated SGI */
552 int irqgrp = gicv3_irq_group(cs->gic, cs, irq);
554 /* If we are asked for a Secure Group 1 SGI and it's actually
555 * configured as Secure Group 0 this is OK (subject to the usual
558 if (grp == GICV3_G1 && irqgrp == GICV3_G0) {
566 if (ns && !(cs->gic->gicd_ctlr & GICD_CTLR_DS)) {
567 /* If security is enabled we must test the NSACR bits */
568 int nsaccess = gicr_ns_access(cs, irq);
570 if ((irqgrp == GICV3_G0 && nsaccess < 1) ||
571 (irqgrp == GICV3_G1 && nsaccess < 2)) {
576 /* OK, we can accept the SGI */
577 trace_gicv3_redist_send_sgi(gicv3_redist_affid(cs), irq);
578 cs->gicr_ipendr0 = deposit32(cs->gicr_ipendr0, irq, 1, 1);
579 gicv3_redist_update(cs);