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Differential D23511

Use csr_read() to read sstatus instead of inline assembly.
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Authored by jhb on Feb 5 2020, 12:15 AM.
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br
mhorne
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rS357594: Use csr_read() to read sstatus instead of inline assembly.
Summary

While here, remove a local variable to avoid the CSR read in non-debug
kernels.

Test Plan
  • booted kernels under spike and qemu

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Unit
Tests Not Applicable

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head/
sys/
riscv/
riscv/
12 lines

Diff 67828

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head/sys/riscv/riscv/trap.c

Show First 20 Lines • Show All 701 Lines • ▼ Show 20 Linesieee80211_phy_vht_validate_mcs(enum ieee80211_sta_rx_bw bw, uint8_t nss,
uint16_t mask; uint16_t mask;
mask = ieee80211_phy_vht_get_mcs_mask(bw, nss); mask = ieee80211_phy_vht_get_mcs_mask(bw, nss);
if (mask == 0) if (mask == 0)
return (false); return (false);
return ((mask & (1 << mcs)) != 0); return ((mask & (1 << mcs)) != 0);
} }
struct mcs_entry {
int n_sym; /* Number of bits per symbol */
int cod_n; /* Coding rate numerator */
int cod_d; /* Coding rate denominator */
};
/*
* These parameters are taken from 802.11-2020 Table 21-29
* (VHT-MCSs for Mandatory 20 MHZ, Nss=1).
*
* n_sym corresponds to "Nbpscs", cod_n/cod_d corresponds to
* "R".
*/
static struct mcs_entry mcs_entries[] = {
{ 1, 1, 2 }, /* MCS0 */
{ 2, 1, 2 },
{ 2, 3, 4 },
{ 4, 1, 2 },
{ 4, 3, 4 },
{ 6, 2, 3 },
{ 6, 3, 4 },
{ 6, 5, 6 },
{ 8, 3, 4 },
{ 8, 5, 6 }, /* MCS9 */
};
/**
* @brief Calculate the bitrate of the given VHT MCS rate.
*
* @param bw Channel bandwidth (enum ieee80211_sta_rx_bw)
* @param nss Number of spatial streams, 1..8
* @param mcs MCS, 0..9
* @param is_shortgi True if short guard-interval (400nS)
* false otherwise (800nS)
*
* @returns The bitrate in kbit/sec.
*/
uint32_t
ieee80211_phy_vht_get_mcs_kbit(enum ieee80211_sta_rx_bw bw,
uint8_t nss, uint8_t mcs, bool is_shortgi)
{
uint32_t sym_len, n_carriers;
/* Validate MCS 0..9, NSS 1..8 */
if (mcs > 9)
return (0);
if (nss == 0 || nss > 8)
return (0);
/*
* Short-GI - 3.6uS symbol time, long-GI - 4.0uS symbol time
*
* See 802.11-2020 Table 21-5 (Timing-related constraints.)
*/
if (is_shortgi)
sym_len = 36;
else
sym_len = 40;
/*
* Calculate the number of carriers for the given channel bandwidth
*
* See 802.11-2020 Table 21-5 (Timing-related constraints.)
*/
switch (bw) {
case IEEE80211_STA_RX_BW_20:
n_carriers = 52;
break;
case IEEE80211_STA_RX_BW_40:
n_carriers = 108;
break;
case IEEE80211_STA_RX_BW_80:
n_carriers = 234;
break;
case IEEE80211_STA_RX_BW_160:
n_carriers = 468;
break;
default:
return (0);
}
return ((n_carriers * mcs_entries[mcs].n_sym * mcs_entries[mcs].cod_n *
nss * 10000) / (mcs_entries[mcs].cod_d * sym_len));
}