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MFC: Cache the value of the lower half of each I/O APIC redirection table

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entry and thus cut the execution time for masking and unmasking I/O APIC
pins in half.
This commit is contained in:
jhb 2006-05-18 22:07:01 +00:00
parent fd3b56a33d
commit 42f7829611
2 changed files with 8 additions and 12 deletions
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10
sys/amd64/amd64/io_apic.c
View File

@ -85,6 +85,7 @@ struct ioapic_intsrc {
u_int io_edgetrigger:1;
u_int io_masked:1;
int io_bus:4;
uint32_t io_lowreg;
};
struct ioapic {
@ -203,9 +204,7 @@ ioapic_enable_source(struct intsrc *isrc)
mtx_lock_spin(&icu_lock);
if (intpin->io_masked) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags &= ~(IOART_INTMASK);
flags = intpin->io_lowreg & ~IOART_INTMASK;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 0;
@ -222,9 +221,7 @@ ioapic_disable_source(struct intsrc *isrc, int eoi)
mtx_lock_spin(&icu_lock);
if (!intpin->io_masked && !intpin->io_edgetrigger) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags |= IOART_INTMSET;
flags = intpin->io_lowreg | IOART_INTMSET;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 1;
@ -309,6 +306,7 @@ ioapic_program_intpin(struct ioapic_intsrc *intpin)
/* Write the values to the APIC. */
mtx_lock_spin(&icu_lock);
intpin->io_lowreg = low;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin), low);
value = ioapic_read(io->io_addr, IOAPIC_REDTBL_HI(intpin->io_intpin));
value &= ~IOART_DEST;

10
sys/i386/i386/io_apic.c
View File

@ -84,6 +84,7 @@ struct ioapic_intsrc {
u_int io_edgetrigger:1;
u_int io_masked:1;
int io_bus:4;
uint32_t io_lowreg;
};
struct ioapic {
@ -202,9 +203,7 @@ ioapic_enable_source(struct intsrc *isrc)
mtx_lock_spin(&icu_lock);
if (intpin->io_masked) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags &= ~(IOART_INTMASK);
flags = intpin->io_lowreg & ~IOART_INTMASK;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 0;
@ -221,9 +220,7 @@ ioapic_disable_source(struct intsrc *isrc, int eoi)
mtx_lock_spin(&icu_lock);
if (!intpin->io_masked && !intpin->io_edgetrigger) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags |= IOART_INTMSET;
flags = intpin->io_lowreg | IOART_INTMSET;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 1;
@ -308,6 +305,7 @@ ioapic_program_intpin(struct ioapic_intsrc *intpin)
/* Write the values to the APIC. */
mtx_lock_spin(&icu_lock);
intpin->io_lowreg = low;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin), low);
value = ioapic_read(io->io_addr, IOAPIC_REDTBL_HI(intpin->io_intpin));
value &= ~IOART_DEST;