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hw/intc/armv7m_nvic: Implement v8M CPPWR register

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The Coprocessor Power Control Register (CPPWR) is new in v8M.
It allows software to control whether coprocessors are allowed
to power down and lose their state. QEMU doesn't have any
notion of power control, so we choose the IMPDEF option of
making the whole register RAZ/WI (indicating that no coprocessors
can ever power down and lose state).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180209165810.6668-5-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-02-15 18:29:37 +00:00
parent e8ab26c484
commit ae7c5c855b
1 changed files with 14 additions and 0 deletions
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14
hw/intc/armv7m_nvic.c
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@ -776,6 +776,14 @@ static uint32_t nvic_readl(NVICState *s, uint32_t offset, MemTxAttrs attrs)
switch (offset) {
case 4: /* Interrupt Control Type. */
return ((s->num_irq - NVIC_FIRST_IRQ) / 32) - 1;
case 0xc: /* CPPWR */
if (!arm_feature(&cpu->env, ARM_FEATURE_V8)) {
goto bad_offset;
}
/* We make the IMPDEF choice that nothing can ever go into a
* non-retentive power state, which allows us to RAZ/WI this.
*/
return 0;
case 0x380 ... 0x3bf: /* NVIC_ITNS<n> */
{
int startvec = 8 * (offset - 0x380) + NVIC_FIRST_IRQ;
@ -1175,6 +1183,12 @@ static void nvic_writel(NVICState *s, uint32_t offset, uint32_t value,
ARMCPU *cpu = s->cpu;
switch (offset) {
case 0xc: /* CPPWR */
if (!arm_feature(&cpu->env, ARM_FEATURE_V8)) {
goto bad_offset;
}
/* Make the IMPDEF choice to RAZ/WI this. */
break;
case 0x380 ... 0x3bf: /* NVIC_ITNS<n> */
{
int startvec = 8 * (offset - 0x380) + NVIC_FIRST_IRQ;