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hw/intc/armv7m_nvic: Implement SCR

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We were previously making the system control register (SCR)
just RAZ/WI. Although we don't implement the functionality
this register controls, we should at least provide the state,
including the banked state for v8M.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180209165810.6668-7-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-02-15 18:29:37 +00:00
parent 43bbce7fbe
commit 24ac0fb129
3 changed files with 27 additions and 4 deletions
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12
hw/intc/armv7m_nvic.c
View File

@ -863,8 +863,7 @@ static uint32_t nvic_readl(NVICState *s, uint32_t offset, MemTxAttrs attrs)
}
return val;
case 0xd10: /* System Control. */
/* TODO: Implement SLEEPONEXIT. */
return 0;
return cpu->env.v7m.scr[attrs.secure];
case 0xd14: /* Configuration Control. */
/* The BFHFNMIGN bit is the only non-banked bit; we
* keep it in the non-secure copy of the register.
@ -1285,8 +1284,13 @@ static void nvic_writel(NVICState *s, uint32_t offset, uint32_t value,
}
break;
case 0xd10: /* System Control. */
/* TODO: Implement control registers. */
qemu_log_mask(LOG_UNIMP, "NVIC: SCR unimplemented\n");
/* We don't implement deep-sleep so these bits are RAZ/WI.
* The other bits in the register are banked.
* QEMU's implementation ignores SEVONPEND and SLEEPONEXIT, which
* is architecturally permitted.
*/
value &= ~(R_V7M_SCR_SLEEPDEEP_MASK | R_V7M_SCR_SLEEPDEEPS_MASK);
cpu->env.v7m.scr[attrs.secure] = value;
break;
case 0xd14: /* Configuration Control. */
/* Enforce RAZ/WI on reserved and must-RAZ/WI bits */

7
target/arm/cpu.h
View File

@ -497,6 +497,7 @@ typedef struct CPUARMState {
uint32_t aircr; /* only holds r/w state if security extn implemented */
uint32_t secure; /* Is CPU in Secure state? (not guest visible) */
uint32_t csselr[M_REG_NUM_BANKS];
uint32_t scr[M_REG_NUM_BANKS];
} v7m;
/* Information associated with an exception about to be taken:
@ -1258,6 +1259,12 @@ FIELD(V7M_CCR, STKALIGN, 9, 1)
FIELD(V7M_CCR, DC, 16, 1)
FIELD(V7M_CCR, IC, 17, 1)
/* V7M SCR bits */
FIELD(V7M_SCR, SLEEPONEXIT, 1, 1)
FIELD(V7M_SCR, SLEEPDEEP, 2, 1)
FIELD(V7M_SCR, SLEEPDEEPS, 3, 1)
FIELD(V7M_SCR, SEVONPEND, 4, 1)
/* V7M AIRCR bits */
FIELD(V7M_AIRCR, VECTRESET, 0, 1)
FIELD(V7M_AIRCR, VECTCLRACTIVE, 1, 1)

12
target/arm/machine.c
View File

@ -226,6 +226,16 @@ static const VMStateDescription vmstate_m_csselr = {
}
};
static const VMStateDescription vmstate_m_scr = {
.name = "cpu/m/scr",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(env.v7m.scr[M_REG_NS], ARMCPU),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_m = {
.name = "cpu/m",
.version_id = 4,
@ -248,6 +258,7 @@ static const VMStateDescription vmstate_m = {
.subsections = (const VMStateDescription*[]) {
&vmstate_m_faultmask_primask,
&vmstate_m_csselr,
&vmstate_m_scr,
NULL
}
};
@ -411,6 +422,7 @@ static const VMStateDescription vmstate_m_security = {
VMSTATE_UINT32(env.sau.rnr, ARMCPU),
VMSTATE_VALIDATE("SAU_RNR is valid", sau_rnr_vmstate_validate),
VMSTATE_UINT32(env.sau.ctrl, ARMCPU),
VMSTATE_UINT32(env.v7m.scr[M_REG_S], ARMCPU),
VMSTATE_END_OF_LIST()
}
};