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x86: SGI UV: Map low MMR ranges

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Explicitly mmap the UV chipset MMR address ranges used to
access blade-local registers. Although these same MMRs are also
mmaped at higher addresses, the low range is more
convenient when accessing blade-local registers.

The low range addresses always alias to the local blade
regardless of the blade id.

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20091125162018.GA25445@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jack Steiner 2009-11-25 10:20:19 -06:00 committed by Ingo Molnar
parent 163d3866cf
commit 918bc960dc
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/apic/x2apic_uv_x.c
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@ -409,6 +409,12 @@ static __init void map_mmioh_high(int max_pnode)
map_high("MMIOH", mmioh.s.base, shift, max_pnode, map_uc);
}
static __init void map_low_mmrs(void)
{
init_extra_mapping_uc(UV_GLOBAL_MMR32_BASE, UV_GLOBAL_MMR32_SIZE);
init_extra_mapping_uc(UV_LOCAL_MMR_BASE, UV_LOCAL_MMR_SIZE);
}
static __init void uv_rtc_init(void)
{
long status;
@ -550,6 +556,8 @@ void __init uv_system_init(void)
unsigned long mmr_base, present, paddr;
unsigned short pnode_mask;
map_low_mmrs();
m_n_config.v = uv_read_local_mmr(UVH_SI_ADDR_MAP_CONFIG);
m_val = m_n_config.s.m_skt;
n_val = m_n_config.s.n_skt;