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HV:treewide:Update return type for function fls64 and clz64

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Change the return type of function fls64 and clz64 as uint16_t;
When the input is zero, INVALID_ID_INDEX is returned;
Update temporary variable type and return value check of caller
when it call fls64 or clz64;
When input value is zero, clz64 returns 64 directly.

V1-->V2:
        INVALID_BIT_INDEX instead of INVALID_NUMBER;
        Partly revert apicv_pending_intr udpates;
        Add type conversion as needed;
        Coding style fixing.
V2-->V3:
        Correct type conversion;
        fls64 return INVALID_BIT_INDEX directly when
        the input value is zero.
V3-->V4:
        No updates for this part in PATCH V4.

Note: For instruction "bsrq", destination register value
      is undefined when source register value is zero.

Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Xiangyang Wu 2018-07-02 13:58:03 +08:00 committed by lijinxia
parent 13d354e7a6
commit db01efa047
3 changed files with 20 additions and 16 deletions
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13
hypervisor/arch/x86/guest/vlapic.c
View File

@ -2104,7 +2104,7 @@ apicv_pending_intr(struct vlapic *vlapic, __unused uint32_t *vecptr)
for (i = 3; i >= 0; i--) {
pirval = pir_desc->pir[i];
if (pirval != 0) {
vpr = (i * 64 + fls64(pirval)) & 0xF0U;
vpr = (((uint32_t)(i * 64) + (uint32_t)fls64(pirval)) & 0xF0U);
return (vpr > ppr);
}
}
@ -2188,7 +2188,7 @@ apicv_inject_pir(struct vlapic *vlapic)
struct pir_desc *pir_desc;
struct lapic_regs *lapic;
uint64_t val, pirval;
int rvi, pirbase = -1, i;
uint16_t rvi, pirbase = 0U, i;
uint16_t intr_status_old, intr_status_new;
struct lapic_reg *irr = NULL;
@ -2197,17 +2197,16 @@ apicv_inject_pir(struct vlapic *vlapic)
return;
pirval = 0;
pirbase = -1;
lapic = vlapic->apic_page;
irr = &lapic->irr[0];
for (i = 0; i < 4; i++) {
for (i = 0U; i < 4U; i++) {
val = atomic_readandclear64((long *)&pir_desc->pir[i]);
if (val != 0) {
irr[i * 2].val |= val;
irr[(i * 2) + 1].val |= val >> 32;
irr[i * 2U].val |= val;
irr[(i * 2U) + 1U].val |= val >> 32;
pirbase = 64*i;
pirbase = 64U*i;
pirval = val;
}
}

21
hypervisor/include/lib/bits.h
View File

@ -74,14 +74,15 @@ static inline uint16_t fls(uint32_t value)
return (uint16_t)ret;
}
static inline int fls64(unsigned long value)
static inline uint16_t fls64(uint64_t value)
{
int ret;
asm volatile("bsrq %1,%q0"
uint64_t ret = 0UL;
if (value == 0UL)
return (INVALID_BIT_INDEX);
asm volatile("bsrq %1,%0"
: "=r" (ret)
: "rm" (value), "0" (-1));
return ret;
: "rm" (value));
return (uint16_t)ret;
}
/**
@ -152,9 +153,13 @@ static inline uint16_t clz(uint32_t value)
*
* @return The number of leading zeros in 'value'.
*/
static inline int clz64(unsigned long value)
static inline uint16_t clz64(uint64_t value)
{
return (63 - fls64(value));
if (value == 0UL)
return 64U;
else{
return (63U - fls64(value));
}
}
/*

2
hypervisor/lib/div.c
View File

@ -94,7 +94,7 @@ int udiv64(uint64_t dividend, uint64_t divisor, struct udiv_result *res)
*/
/* align divisor and dividend. */
bits = clz64(divisor) - clz64(dividend);
bits = (uint64_t)(clz64(divisor) - clz64(dividend));
divisor <<= bits;
mask = 1UL << bits;
/* division loop */