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-rw-r--r--arch/x86/kernel/cpu/mtrr/generic.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 103d61a59b1..3e18db4cefe 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -176,12 +176,13 @@ static inline void k8_enable_fixed_iorrs(void)
176} 176}
177 177
178/** 178/**
179 * Checks and updates an fixed-range MTRR if it differs from the value it 179 * set_fixed_range - checks & updates a fixed-range MTRR if it differs from the value it should have
180 * should have. If K8 extentions are wanted, update the K8 SYSCFG MSR also. 180 * @msr: MSR address of the MTTR which should be checked and updated
181 * see AMD publication no. 24593, chapter 7.8.1, page 233 for more information 181 * @changed: pointer which indicates whether the MTRR needed to be changed
182 * \param msr MSR address of the MTTR which should be checked and updated 182 * @msrwords: pointer to the MSR values which the MSR should have
183 * \param changed pointer which indicates whether the MTRR needed to be changed 183 *
184 * \param msrwords pointer to the MSR values which the MSR should have 184 * If K8 extentions are wanted, update the K8 SYSCFG MSR also.
185 * See AMD publication no. 24593, chapter 7.8.1, page 233 for more information.
185 */ 186 */
186static void set_fixed_range(int msr, bool *changed, unsigned int *msrwords) 187static void set_fixed_range(int msr, bool *changed, unsigned int *msrwords)
187{ 188{
@@ -199,12 +200,15 @@ static void set_fixed_range(int msr, bool *changed, unsigned int *msrwords)
199 } 200 }
200} 201}
201 202
203/**
204 * generic_get_free_region - Get a free MTRR.
205 * @base: The starting (base) address of the region.
206 * @size: The size (in bytes) of the region.
207 * @replace_reg: mtrr index to be replaced; set to invalid value if none.
208 *
209 * Returns: The index of the region on success, else negative on error.
210 */
202int generic_get_free_region(unsigned long base, unsigned long size, int replace_reg) 211int generic_get_free_region(unsigned long base, unsigned long size, int replace_reg)
203/* [SUMMARY] Get a free MTRR.
204 <base> The starting (base) address of the region.
205 <size> The size (in bytes) of the region.
206 [RETURNS] The index of the region on success, else -1 on error.
207*/
208{ 212{
209 int i, max; 213 int i, max;
210 mtrr_type ltype; 214 mtrr_type ltype;
@@ -249,8 +253,8 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base,
249} 253}
250 254
251/** 255/**
252 * Checks and updates the fixed-range MTRRs if they differ from the saved set 256 * set_fixed_ranges - checks & updates the fixed-range MTRRs if they differ from the saved set
253 * \param frs pointer to fixed-range MTRR values, saved by get_fixed_ranges() 257 * @frs: pointer to fixed-range MTRR values, saved by get_fixed_ranges()
254 */ 258 */
255static int set_fixed_ranges(mtrr_type * frs) 259static int set_fixed_ranges(mtrr_type * frs)
256{ 260{
@@ -294,13 +298,13 @@ static bool set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)
294 298
295static u32 deftype_lo, deftype_hi; 299static u32 deftype_lo, deftype_hi;
296 300
301/**
302 * set_mtrr_state - Set the MTRR state for this CPU.
303 *
304 * NOTE: The CPU must already be in a safe state for MTRR changes.
305 * RETURNS: 0 if no changes made, else a mask indicating what was changed.
306 */
297static unsigned long set_mtrr_state(void) 307static unsigned long set_mtrr_state(void)
298/* [SUMMARY] Set the MTRR state for this CPU.
299 <state> The MTRR state information to read.
300 <ctxt> Some relevant CPU context.
301 [NOTE] The CPU must already be in a safe state for MTRR changes.
302 [RETURNS] 0 if no changes made, else a mask indication what was changed.
303*/
304{ 308{
305 unsigned int i; 309 unsigned int i;
306 unsigned long change_mask = 0; 310 unsigned long change_mask = 0;