[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 01/13] Xen : Hide UART used by Xen
From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> According to the STAO table, hide UART used by Xen from Dom0. Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> --- drivers/acpi/bus.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index a212cef..e93806b 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -46,6 +46,7 @@ ACPI_MODULE_NAME("bus"); struct acpi_device *acpi_root; struct proc_dir_entry *acpi_root_dir; EXPORT_SYMBOL(acpi_root_dir); +static u64 uart_addr; #ifdef CONFIG_X86 #ifdef CONFIG_ACPI_CUSTOM_DSDT @@ -93,6 +94,16 @@ acpi_status acpi_bus_get_status_handle(acpi_handle handle, { acpi_status status; + if (uart_addr) { + u64 addr; + status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, + &addr); + if (ACPI_SUCCESS(status) && (addr == uart_addr)) { + *sta = 0; + return AE_OK; + } + } + status = acpi_evaluate_integer(handle, "_STA", NULL, sta); if (ACPI_SUCCESS(status)) return AE_OK; @@ -1069,6 +1080,7 @@ EXPORT_SYMBOL_GPL(acpi_kobj); static int __init acpi_init(void) { int result; + struct acpi_table_stao *stao_ptr; if (acpi_disabled) { printk(KERN_INFO PREFIX "Interpreter disabled.\n"); @@ -1081,6 +1093,16 @@ static int __init acpi_init(void) acpi_kobj = NULL; } + acpi_get_table(ACPI_SIG_STAO, 1, + (struct acpi_table_header **)&stao_ptr); + if(stao_ptr->ignore_uart) + { + struct acpi_table_spcr *spcr_ptr; + acpi_get_table(ACPI_SIG_SPCR, 1, + (struct acpi_table_header **)&spcr_ptr); + uart_addr = spcr_ptr->serial_port.address; + } + init_acpi_device_notify(); result = acpi_bus_init(); if (result) { -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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