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Red Hat Bugzilla – Attachment 609860 Details for
Bug 854448
add pmtimer support
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[patch]
upstream patch
0001-add-acpi-pmtimer-support.patch (text/plain), 3.44 KB, created by
Gerd Hoffmann
on 2012-09-05 05:37:18 UTC
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Description:
upstream patch
Filename:
MIME Type:
Creator:
Gerd Hoffmann
Created:
2012-09-05 05:37:18 UTC
Size:
3.44 KB
patch
obsolete
>From 34f39ce89b30c6f9809adca2046fdaf41a08be76 Mon Sep 17 00:00:00 2001 >From: Gerd Hoffmann <kraxel@redhat.com> >Date: Mon, 13 Aug 2012 13:27:38 +0200 >Subject: [PATCH v3] add acpi pmtimer support > >This patch makes seabios use the acpi pmtimer instead of tsc for >timekeeping. The pmtimer has a fixed frequency and doesn't need >calibration, thus it doesn't suffer from calibration errors due to a >loaded host machine. > >[ v3: mask port ioport read ] >[ v2: add CONFIG_PMTIMER ] > >Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> >--- > src/Kconfig | 6 ++++++ > src/clock.c | 31 +++++++++++++++++++++++++++++++ > src/pciinit.c | 5 +++++ > src/util.h | 1 + > 4 files changed, 43 insertions(+), 0 deletions(-) > >diff --git a/src/Kconfig b/src/Kconfig >index 6de3e71..b5dd63b 100644 >--- a/src/Kconfig >+++ b/src/Kconfig >@@ -222,6 +222,12 @@ menu "Hardware support" > default y > help > Initialize the Memory Type Range Registers (on emulators). >+ config PMTIMER >+ depends on !COREBOOT >+ bool "Use ACPI timer" >+ default y >+ help >+ Use the ACPI timer instead of the TSC for timekeeping (on qemu). > endmenu > > menu "BIOS interfaces" >diff --git a/src/clock.c b/src/clock.c >index 69e9f17..b4abf37 100644 >--- a/src/clock.c >+++ b/src/clock.c >@@ -129,11 +129,42 @@ emulate_tsc(void) > return ret; > } > >+u16 pmtimer_ioport VAR16VISIBLE; >+u32 pmtimer_wraps VARLOW; >+u32 pmtimer_last VARLOW; >+ >+void pmtimer_init(u16 ioport, u32 khz) >+{ >+ if (!CONFIG_PMTIMER) >+ return; >+ dprintf(1, "Using pmtimer, ioport 0x%x, freq %d kHz\n", ioport, khz); >+ SET_GLOBAL(pmtimer_ioport, ioport); >+ SET_GLOBAL(cpu_khz, khz); >+} >+ >+static u64 pmtimer_get(void) >+{ >+ u16 ioport = GET_GLOBAL(pmtimer_ioport); >+ u32 wraps = GET_LOW(pmtimer_wraps); >+ u32 pmtimer = inl(ioport); >+ >+ if (pmtimer < GET_LOW(pmtimer_last)) { >+ wraps++; >+ SET_LOW(pmtimer_wraps, wraps); >+ } >+ SET_LOW(pmtimer_last, pmtimer); >+ >+ dprintf(9, "pmtimer: %u:%u\n", wraps, pmtimer); >+ return (u64)wraps << 24 | pmtimer; >+} >+ > static u64 > get_tsc(void) > { > if (unlikely(GET_GLOBAL(no_tsc))) > return emulate_tsc(); >+ if (CONFIG_PMTIMER && GET_GLOBAL(pmtimer_ioport)) >+ return pmtimer_get(); > return rdtscll(); > } > >diff --git a/src/pciinit.c b/src/pciinit.c >index 68f302a..31115ee 100644 >--- a/src/pciinit.c >+++ b/src/pciinit.c >@@ -180,6 +180,9 @@ static const struct pci_device_id pci_class_tbl[] = { > PCI_DEVICE_END, > }; > >+/* PM Timer ticks per second (HZ) */ >+#define PM_TIMER_FREQUENCY 3579545 >+ > /* PIIX4 Power Management device (for ACPI) */ > static void piix4_pm_init(struct pci_device *pci, void *arg) > { >@@ -191,6 +194,8 @@ static void piix4_pm_init(struct pci_device *pci, void *arg) > pci_config_writeb(bdf, 0x80, 0x01); /* enable PM io space */ > pci_config_writel(bdf, 0x90, PORT_SMB_BASE | 1); > pci_config_writeb(bdf, 0xd2, 0x09); /* enable SMBus io space */ >+ >+ pmtimer_init(PORT_ACPI_PM_BASE + 0x08, PM_TIMER_FREQUENCY / 1000); > } > > static const struct pci_device_id pci_device_tbl[] = { >diff --git a/src/util.h b/src/util.h >index 062eea3..7723bb1 100644 >--- a/src/util.h >+++ b/src/util.h >@@ -282,6 +282,7 @@ void lpt_setup(void); > // clock.c > #define PIT_TICK_RATE 1193180 // Underlying HZ of PIT > #define PIT_TICK_INTERVAL 65536 // Default interval for 18.2Hz timer >+void pmtimer_init(u16 ioport, u32 khz); > int check_tsc(u64 end); > void timer_setup(void); > void ndelay(u32 count); >-- >1.7.1 >
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bug 854448
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