1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  osi.c - _OSI implementation
27 	bool enable;  member
30 static struct acpi_osi_config {
40 static struct acpi_osi_config osi_config;
41 static struct acpi_osi_entry
49 static u32 acpi_osi_handler(acpi_string interface, u32 supported)  in acpi_osi_handler()
72 	bool enable = true;  in acpi_osi_setup()  local
96 				osi->enable = false;  in acpi_osi_setup()
103 		enable = false;  in acpi_osi_setup()
108 		if (!strcmp(osi->string, str)) {  in acpi_osi_setup()
109 			osi->enable = enable;  in acpi_osi_setup()
111 		} else if (osi->string[0] == '\0') {  in acpi_osi_setup()
112 			osi->enable = enable;  in acpi_osi_setup()
113 			strscpy(osi->string, str, OSI_STRING_LENGTH_MAX);  in acpi_osi_setup()
119 static void __init __acpi_osi_setup_darwin(bool enable)  in __acpi_osi_setup_darwin()  argument
121 	osi_config.darwin_enable = !!enable;  in __acpi_osi_setup_darwin()
122 	if (enable) {  in __acpi_osi_setup_darwin()
131 static void __init acpi_osi_setup_darwin(bool enable)  in acpi_osi_setup_darwin()  argument
136 	__acpi_osi_setup_darwin(enable);  in acpi_osi_setup_darwin()
142  * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
147  * ill-conceived and opening the door to an un-bounded number of BIOS
150  * For example, OSI(Linux) was used on resume to re-POST a video card on
153  * capability, Linux has no way to tell the BIOS to skip the time-consuming
154  * POST -- putting Linux at a permanent performance disadvantage. On
161  * Linux-2.6.23 onward we respond FALSE.
168 static void __init __acpi_osi_setup_linux(bool enable)  in __acpi_osi_setup_linux()  argument
170 	osi_config.linux_enable = !!enable;  in __acpi_osi_setup_linux()
171 	if (enable)  in __acpi_osi_setup_linux()
177 static void __init acpi_osi_setup_linux(bool enable)  in acpi_osi_setup_linux()  argument
182 	__acpi_osi_setup_linux(enable);  in acpi_osi_setup_linux()
190  * otherwise string is added to list, augmenting built-in strings
192 static void __init acpi_osi_setup_late(void)  in acpi_osi_setup_late()
210 		str = osi->string;  in acpi_osi_setup_late()
213 		if (osi->enable) {  in acpi_osi_setup_late()
225 static int __init osi_setup(char *str)  in osi_setup()
248 static void __init acpi_osi_dmi_darwin(void)  in acpi_osi_dmi_darwin()
255 static void __init acpi_osi_dmi_linux(bool enable,  in acpi_osi_dmi_linux()  argument
258 	pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);  in acpi_osi_dmi_linux()
260 	__acpi_osi_setup_linux(enable);  in acpi_osi_dmi_linux()
263 static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)  in dmi_enable_osi_linux()
270 static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)  in dmi_disable_osi_vista()
272 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_vista()
280 static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)  in dmi_disable_osi_win7()
282 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_win7()
288 static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)  in dmi_disable_osi_win8()
290 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_win8()
302 static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
324 		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
330 	.ident = "Sony VGN-NS10J_S",
333 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
338 	.ident = "Sony VGN-SR290J",
341 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
346 	.ident = "VGN-NS50B_L",
349 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
354 	.ident = "VGN-SR19XN",
357 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
467 static __init void acpi_osi_dmi_blacklisted(void)  in acpi_osi_dmi_blacklisted()
471 	/* Enable _OSI("Darwin") for Apple platforms. */  in acpi_osi_dmi_blacklisted()