From dcd83aaff1c8cbd5b48c152b559e0af3ea1a7b65 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Fri, 8 Jul 2011 19:06:12 -0500 Subject: tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver The ePAPR embedded hypervisor specification provides an API for "byte channels", which are serial-like virtual devices for sending and receiving streams of bytes. This driver provides Linux kernel support for byte channels via three distinct interfaces: 1) An early-console (udbg) driver. This provides early console output through a byte channel. The byte channel handle must be specified in a Kconfig option. 2) A normal console driver. Output is sent to the byte channel designated for stdout in the device tree. The console driver is for handling kernel printk calls. 3) A tty driver, which is used to handle user-space input and output. The byte channel used for the console is designated as the default tty. Signed-off-by: Timur Tabi Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/include/asm/udbg.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include') diff --git a/arch/powerpc/include/asm/udbg.h b/arch/powerpc/include/asm/udbg.h index 93e05d1b34b..5354ae91bdd 100644 --- a/arch/powerpc/include/asm/udbg.h +++ b/arch/powerpc/include/asm/udbg.h @@ -54,6 +54,7 @@ extern void __init udbg_init_40x_realmode(void); extern void __init udbg_init_cpm(void); extern void __init udbg_init_usbgecko(void); extern void __init udbg_init_wsp(void); +extern void __init udbg_init_ehv_bc(void); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_UDBG_H */ -- cgit v1.2.3