Andre Guedes cb0510ebcf x86: Disable NMI while initializing RTC ... According to [1], we should disable non-maskable and maskable interrupts while initializing RTC. Otherwise, the RTC may be left in an undefined state (non-functional) if an interrupt occurs. Currently, maskable interrupts are already disabled, but NMI is not. This patch adds helpers APIs to enable/disable non-maskable interrupts (NMI) and changes rtc_init() to disable NMI while initializing the RTC. NMI enable/disable code is legacy-PC specific therefore it was put in driver/legacy_pc/ directory. Regarding the RTC initialization changes, just calling nmi_disable() and nmi_enable is not enough since NMI and RTC share the same IO port. So We should also set the NMI_ENABLE bit while selecting the RTC_INDEX. Additionally, the nmi_disable() call is not strictly required since we set the NMI_ENABLE bit while selecting the RTC_INDEX. However, to make clear hat we are disabling NMI and to improve readability (by matching NMI disable/enable), the nmi_disable() call was purposely used. [1] http://wiki.osdev.org/RTC		2015-12-21 08:06:14 -02:00
..
drivers/legacy_pc	x86: Disable NMI while initializing RTC	2015-12-21 08:06:14 -02:00
init	x86: Isolate SoC specific cpu_init code	2015-12-21 08:06:14 -02:00
bootstrap_quarkX1000.S	x86: Move bootstrap code and linker script to cpu/x86	2015-12-21 08:06:14 -02:00
helpers.h	x86: Add Real-Time Clock Driver	2015-12-21 08:06:14 -02:00
helpers.S	x86: Add Real-Time Clock Driver	2015-12-21 08:06:14 -02:00
Makefile.x86_common	x86: Add init folder and move code accordingly	2015-12-21 08:06:14 -02:00
Makefile.x86_quarkX1000	x86: Disable NMI while initializing RTC	2015-12-21 08:06:14 -02:00
quarkX1000.ld	x86: Move bootstrap code and linker script to cpu/x86	2015-12-21 08:06:14 -02:00