1 // SPDX-License-Identifier: GPL-2.0
12 	unsigned long low;  member
19  * centaur_get_free_region - Get a free MTRR.
24  * Returns: the index of the region on success, else -1 on error.
40 		mtrr_if->get(i, &lbase, &lsize, &ltype);  in centaur_get_free_region()
45 	return -ENOSPC;  in centaur_get_free_region()
53 	centaur_mcr[mcr].low = lo;  in mtrr_centaur_report_mcr()
62 	*size = -(centaur_mcr[reg].low & 0xfffff000) >> PAGE_SHIFT;  in centaur_get_mcr()
63 	*type = MTRR_TYPE_WRCOMB;		/* write-combining  */  in centaur_get_mcr()
65 	if (centaur_mcr_type == 1 && ((centaur_mcr[reg].low & 31) & 2))  in centaur_get_mcr()
67 	if (centaur_mcr_type == 1 && (centaur_mcr[reg].low & 31) == 25)  in centaur_get_mcr()
69 	if (centaur_mcr_type == 0 && (centaur_mcr[reg].low & 31) == 31)  in centaur_get_mcr()
77 	unsigned long low, high;  in centaur_set_mcr()  local
81 		high = low = 0;  in centaur_set_mcr()
85 			/* Only support write-combining... */  in centaur_set_mcr()
86 			low = -size << PAGE_SHIFT | 0x1f;  in centaur_set_mcr()
89 				low = -size << PAGE_SHIFT | 0x02; /* NC */  in centaur_set_mcr()
91 				low = -size << PAGE_SHIFT | 0x09; /* WWO, WC */  in centaur_set_mcr()
95 	centaur_mcr[reg].low = low;  in centaur_set_mcr()
96 	wrmsr(MSR_IDT_MCR0 + reg, low, high);  in centaur_set_mcr()
107 		pr_warn("mtrr: only write-combining%s supported\n",  in centaur_validate_add_page()
109 		return -EINVAL;  in centaur_validate_add_page()