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| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2021-06-06 22:56:41 +0300 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2021-10-15 12:19:33 +0000 |
| commit | ff556ca9956689640503f33098f7fe3c03b475f1 (patch) | |
| tree | ea18f3e9a73553e2c258a23b8b7b586d0a541d6a /src/cpu | |
| parent | 05ae8f2ff31ba1d02aba15c99025df91588712e1 (diff) | |
cpu/x86/lapic: Split virtual_wire_mode_init()
Only the enable_lapic() part is required while doing
SMP init. Also disable_lapic() must not be called if
we rely on LAPIC for timer source.
Change-Id: Ib5e37c1a0a91fa4e9542141aa74f1c1876fee94e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55261
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/lapic/lapic.c | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/src/cpu/x86/lapic/lapic.c b/src/cpu/x86/lapic/lapic.c index 9aac163d15..bd2fa67afd 100644 --- a/src/cpu/x86/lapic/lapic.c +++ b/src/cpu/x86/lapic/lapic.c @@ -10,12 +10,15 @@ void enable_lapic(void) { msr_t msr; + msr = rdmsr(LAPIC_BASE_MSR); msr.hi &= 0xffffff00; msr.lo &= ~LAPIC_BASE_MSR_ADDR_MASK; msr.lo |= LAPIC_DEFAULT_BASE; msr.lo |= LAPIC_BASE_MSR_ENABLE; wrmsr(LAPIC_BASE_MSR, msr); + + printk(BIOS_INFO, "Setting up local APIC 0x%x\n", lapicid()); } void disable_lapic(void) @@ -39,19 +42,6 @@ static int need_lapic_init(void) static void lapic_virtual_wire_mode_init(void) { - /* this is so interrupts work. This is very limited scope -- - * linux will do better later, we hope ... - */ - /* this is the first way we learned to do it. It fails on real SMP - * stuff. So we have to do things differently ... - * see the Intel mp1.4 spec, page A-3 - */ - - printk(BIOS_INFO, "Setting up local APIC...\n"); - - /* Enable the local APIC */ - enable_lapic(); - /* * Set Task Priority to 'accept all'. */ @@ -70,14 +60,18 @@ static void lapic_virtual_wire_mode_init(void) lapic_update32(LAPIC_LVT1, ~mask, LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING | LAPIC_DELIVERY_MODE_NMI); - printk(BIOS_DEBUG, " apic_id: 0x%x ", lapicid()); - printk(BIOS_INFO, "done.\n"); } void setup_lapic(void) { + /* Enable the local APIC */ if (need_lapic_init()) - lapic_virtual_wire_mode_init(); - else + enable_lapic(); + else if (!CONFIG(UDELAY_LAPIC)) disable_lapic(); + + /* This programming is for PIC mode i8259 interrupts to be delivered to CPU + while LAPIC is enabled. */ + if (need_lapic_init()) + lapic_virtual_wire_mode_init(); } |